Exhibit 10.1

SECOND AMENDMENT TO MASTER SALE AGREEMENT

SECOND AMENDMENT TO MASTER SALE AGREEMENT, dated as of September 16, 2014 (the “Second Amendment”), by and among (a) Telefonaktiebolaget L M Ericsson (publ), a company duly established under the laws of Sweden, with registration number 556016-0680, having its registered office at SE-164 83 Stockholm, Sweden (“LME”), (b) Cluster LLC, a Delaware limited liability company (“E Sub”), (c) Unwired Planet, Inc., a Delaware corporation (“UP”), (d) Unwired Planet IP Holdings, Inc., a Delaware corporation (“UP Sub 1”), (e) Unwired Planet IP Manager, LLC, a Delaware limited liability company (“UP Sub 2” and collectively with UP Sub 1, the “UP Subs”), (f) Unwired Planet, LLC, a Nevada limited liability company (“UPLLC”), and (g) Unwired Planet International Limited, an Irish company limited by shares (“UP International”). All of the foregoing parties are referred to herein as the “Parties” and each, a “Party.”

RECITALS

NOW, THEREFORE, in consideration of the foregoing and the mutual promises made herein and upon the terms and subject to the conditions set forth herein, the Parties hereby agree as follows:

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“Gross Revenue” means, for any fiscal period of UPLLC and its Subsidiaries, all payments, fees, revenues and other amounts or consideration of any kind received, collected or generated by UPLLC and its Subsidiaries for such fiscal period, including under Patent licenses, covenants not to assert, releases from past infringement, technology licenses and Patent sales, transfers, assignments, settlements, arbitrations, litigations, other enforcement actions or any other activities of UPLLC and its Subsidiaries (including any fees and other amounts withheld by third parties who are not Affiliates of UPLLC or UP from any cash and other payments owed to or to be paid to UPLLC and its Subsidiaries (including contingency fee arrangements with attorneys where such fee was withheld by such attorneys from amounts otherwise payable to UPLLC)), as determined in accordance with GAAP consistently applied in the preparation of the audited financial statements of UPLLC, except for the treatment of revenue from multi-year arrangements where GAAP requires such revenue to be recognized in advance of or after the receipt, collection or generation, which shall be included or excluded in Gross Revenue per the second paragraph of this definition; provided that, (i) Gross Revenue from any Specified Mobile Licenses shall be calculated in accordance with Section 3.4(a) and (ii) any amounts actually withheld by a third party from any payments otherwise made by such third party to UPLLC and/or its Subsidiaries as required by a Governmental Authority in respect of Taxes which are not reclaimed by UP or UPLLC (as the case may be) shall be deducted in calculating Gross Revenue for the applicable fiscal period; provided that UP, UPLLC or its Subsidiaries (as the case may be) shall have used reasonable efforts to attempt to reclaim such amounts. Amounts eliminated in consolidation between UPLLC and its Subsidiaries shall not constitute Gross Revenue.

In the event of multi-year arrangements, if GAAP requires payments, fees, revenues and other amounts or consideration of any kind received, collected or generated by UPLLC and/or its Subsidiaries in any fiscal period to be recognized in advance of or after the receipt, collection or generation, any such payments, fees, revenues and other amounts or consideration shall not be included in Gross Revenue for the relevant fiscal period as required by GAAP but shall be included in Gross Revenue in the fiscal period in which such payments, fees, revenues and other amounts or consideration are due to UPLLC and/or its Subsidiaries.

“Restricted Party” means UP and each of its direct and indirect parent entities, controlling Affiliates or Subsidiaries (other than UPLLC or any direct or indirect wholly-owned Subsidiaries of UPLLC). A Person that beneficially owns less than forty percent (40%) of the outstanding voting securities of UP or its parent company and does not otherwise have the power, direct or indirect, to direct or cause the direction of the management and policies of UP or its parent company during the period that UP or its parent company’s voting securities are listed or traded in the public market shall not be deemed a Restricted Party for so long as such securities are listed or publicly traded.

A transaction described in clauses (a), (b) or (c) of this definition in which the holders of a majority of the outstanding voting securities of UP immediately prior to such transaction or series of transactions beneficially own a majority of the outstanding voting securities of the acquirer, successor, person or group immediately after such transactions or series of transactions shall not constitute a UP Change of Control.

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“Bundled” means generating any revenue or otherwise monetizing or creating any economic incentive with respect to any Patent or other Intellectual Property right, including by means of licensing, cross licensing, exchanging, selling, trading, buying or the granting of any implied or express covenant with respect to such Patent or other Intellectual Property right, where such revenue generation or other monetization is, directly or indirectly, provided or combined with, or otherwise offered with any other express or implied economic incentive of any kind with respect to a Covered Patent.

“Wireless Patent” means (i) any Patent containing a claim that is directed at any product or service in the wireless field of use, including, wireless communications networks (including base stations, radio access network devices, switches, routers and related network management services), semiconductors and chipsets enabling wireless communications, mobile phones, tablets and similar end user devices, and all services related thereto (each, a “Covered Patent”), and (ii) any Patent containing any claim that is, directly or indirectly, Bundled, with a Covered Patent. For purposes of clause (i) of this definition, any Patent whose claims are directed at technologies outside of the wireless field of use, e.g. semiconductor technologies, shall not constitute a Covered Patent merely because those claims can be implemented in a product or service that provides wireless or communication functionality.

“(b) Within forty-five (45) days after the completion of each fiscal quarter after the Closing Date, UPLLC shall deliver or cause to be delivered to E Sub an unaudited balance sheet and income statement for UPLLC for the fiscal quarter just ended, prepared in accordance with GAAP consistently applied, certified by a duly authorized officer of UPLLC and a statement, duly certified by an authorized officer of UPLLC (the “Quarterly Cumulative Gross Revenue Statement”) setting forth (i) UPLLC’s Gross Revenue as of fiscal quarter just ended, (ii) UPLLC’s Cumulative Gross Revenue as of the end of the fiscal quarter just ended and (iii) the resulting amount of the payment owed to E Sub calculated in accordance with Section 3.2(a) (each, a “Quarterly Payment”) for the fiscal quarter just ended. The Quarterly Payment shall be paid by UPLLC to E Sub in immediately available funds on the sixtieth (60th) day after the end of each fiscal quarter (each, a “Quarterly Payment Date”). Each Quarterly Cumulative Gross Revenue Statement after the date of the Second Amendment shall contain a reconciliation (including zero) of amounts included or excluded per the second paragraph of definition of Gross Revenue to revenue recognized under GAAP in such fiscal quarter.

“(h) UP shall have the right, but not the obligation, to reduce E Sub’s revenue sharing percentage in Section 3.2(a)(iii) in accordance with this Section 3.2(h). The option provided for in this Section 3.2(h) may be exercised in whole or in part, from time to time until the third anniversary of the date of this Second Amendment, and on such third anniversary this option shall expire. UP may exercise this option by notice to E Sub and LME accompanied by a wire transfer of $5 million per integer percentage point reduction. Any exercise of this option must be for an integer number of percentage points and will be effective as of the first day of next fiscal quarter after the date of such notice and payment and shall apply for the remainder of the term of this Agreement. The maximum aggregate percentage point reduction under this option shall be twenty percent for an aggregate payment of $100,000,000.”

“(c) If E Sub elects to terminate this Agreement and receive a Sale Payment, then, in accordance with Section 3.3(e), UPLLC shall pay to E Sub an aggregate amount (the “Sale Payment”) calculated in accordance with Section 3.2(a), with the Fair Market Value of Target Patents being deemed additional “Cumulative Gross Revenue” for purposes of such calculation, it being understood and agreed that the Sale Payment shall be an amount in addition to (but without duplication of) the Quarterly Payment calculated in accordance with Section 3.2(f) in respect of the fiscal quarter in which the UP Change of Control is consummated; provided that, if the UP Change of Control occurs prior to the fourth (4th) anniversary of the Closing, notwithstanding anything set forth in the foregoing to the contrary and irrespective of what the Fair Market Value of Target Patents is determined to be, in no event shall the Sale Payment be less than an amount equal to (x) $2,000,000,000 minus (y) the aggregate amount of all Quarterly Payments actually received by E Sub pursuant to Section 3.2 on or prior to the date of the payment of the Sale Payment (including the Quarterly Payment payable in accordance with Section 3.2(f)).

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If any Quarterly Payments remain in dispute pursuant to the terms of Section 3.2(c) at the time of determination of the Sale Payment, then the amount included in the foregoing clause (y) shall be the sum of the amounts of all prior Quarterly Payments that are not in dispute and actually paid to E Sub, and any amounts of prior Quarterly Payments remaining in dispute shall either be finally resolved or provided for in escrow or other arrangement reasonably satisfactory to E Sub pursuant to the terms of Section 3.2(f).”

“(a) For the period commencing on the Closing Date and terminating on the earlier of (i) the expiration date of the last of the Ericsson Assigned Patents to expire and (ii) the consummation of a UP Change of Control (the “Restriction Period”), UP shall not, and shall cause each Restricted Party not to, directly or indirectly engage in, anywhere in the world, whether by directly conducting, acquisition of or ownership in, providing services (relating to any Competing Business) to another Person who conducts or otherwise, the business (the “Competing Business”) of generating revenue or otherwise monetizing any Patents by means of licensing or selling of Patents or initiation or participation in litigation or other legal proceedings to protect and enforce any Patent or any other Intellectual Property right or any other business that is competitive with the business of UPLLC as then conducted; provided, however, that (A) nothing set forth herein shall preclude any Restricted Party or its Affiliates from maintaining or undertaking passive investments in any Person primarily engaged in a Competing Business so long as the aggregate interest represented by such investments does not exceed two percent (2%) of any class of the outstanding debt or equity securities of any such Person, (B) the business of generating revenue from the sale of any product where the purchaser of such product receives an implied license to any Patent (other than any Patent owned or controlled by UPLLC) shall not be deemed to be a Competing Business so long as such business is not conducted in a manner or for the purposes of circumventing the restrictions set forth in the first sentence of this Section 6.11(a), and (C) UP and each of the other Restricted Parties may engage in any Competing Business to the extent that the Patents licensed, sold or otherwise directly or indirectly monetized as part of such Competing Business are not Wireless Patents (such non-Wireless Patents, the “Other Patents”) so long as and only to the extent that (w) UP and such Restricted Parties comply with the other provisions of this Agreement, including Section 6.9, the after-acquired patent provisions of the UPLLC License, Section 6.1(w) and Section 6.1(x); (x) UP and any other applicable Restricted Party does not reduce or divert any internal or external resource dedicated to, or which would be otherwise required by, UPLLC and/or its business activities as currently conducted or as conducted in the future, including by means of reducing or diverting the number of employees or consultants, or their time or efforts dedicated to UPLLC, or reducing or diverting any time or efforts of any executive of UP or any other applicable Restricted Party from UPLLC and/or its business activities; (y) neither UP nor any other applicable Restricted Parties may directly or indirectly bundle, combine or otherwise create any economic incentives for any existing or potential customers or licensees of UPLLC or its Subsidiaries to purchase, license or otherwise obtain any rights in or to any combined products or assets of UPLLC and its direct or indirect Subsidiaries, on the one hand, and UP and any Restricted Parties (including any Competing Business), on the other hand, and (z) any such Other Patents could not reasonably be expected to be substitutes for any Patents owned by UPLLC and its Subsidiaries by any customer or licensee of UP or any other Restricted Party; provided, further, that it is expressly agreed and understood by the Parties that, solely with respect to subsection (C) above, to the extent any such Competing Business fails to comply with the terms and conditions set forth in clauses (w)-(z), any and all payments, fees, revenues and other amounts or consideration of any kind received, collected or generated by such Competing Business shall be deemed Gross Revenues for purposes of this Agreement.”

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IN WITNESS WHEREOF, this Second Amendment has been executed by the Parties hereto as of the date first written above.

TELEFONAKTIEBOLAGET L M ERICSSON

CLUSTER LLC

SIGNATURE PAGE TO SECOND AMENDMENT

UNWIRED PLANET, INC.

SIGNATURE PAGE TO SECOND AMENDMENT