Ryan Diaz, an individual and on behalf of all others similarly situated v. T-Mobile USA, Inc., a corporation, and DOES 1 through 50, inclusive

District Court, E.D. California·Decided February 23, 2026·No. 2:25-cv-02933·Unknown

Opinion

----oo0oo---- RYAN DIAZ, an individual and on No. 2:25-cv-02933 WBS CSK behalf of all others similarly situated, Plaintiff, MEMORANDUM AND ORDER RE: DEFENDANT’S MOTION TO COMPEL v. ARBITRATION AND DISMISS CLASS CLAIMS T-MOBILE USA, INC., a corporation, and DOES 1 through 50, inclusive, Defendants. ----oo0oo---- “The impelling considerations that led to the Enactment of the Federal Arbitration Act are the advantages of providing a speedier, more economical, and more effective enforcement of rights by way of arbitration than can be had by the tortuous course of litigation.” Wilko v. Swan, 346 U.S. 427, 439-40 (1953)(Frankfurter, J. dissenting). The advantage of arbitration can be no more obvious than it is in cases brought by employees against their employer, where both sides benefit from the savings in time, costs, and emotional energy inherent in the litigation process. Yet, in this court’s recent experience, the plaintiffs in such cases seem to reflexively resist arbitration to the point where the litigation over the enforceability of the arbitration clause in their employment contract becomes more costly and time-consuming than it would be to simply litigate the merits of their dispute. This appears to be another such case. Plaintiff Ryan Diaz filed this putative class action alleging various California Labor Code violations arising from defendant T-Mobile’s purported failure to provide non- discretionary remuneration, sick pay, and accurate rates of pay on wage statements. (Docket No. 1 at 15.) Defendant has moved to compel arbitration, to dismiss plaintiff’s putative class claims, and to stay the action pending the resolution of individual arbitration. (Docket No. 18 at 19.) I. T-Mobile’s Arbitration Agreement Plaintiff was a T-Mobile employee between 2023 and 2025. (Docket No. 18 at 4.) One of the benefits T-Mobile offers its employees is an annual grant of Restricted Stock Units (RSUs), conditioned on acceptance of several agreements. (Declaration of Aftab Ibrahim (“Ibrahim Decl.”) Docket No. 18-2) ¶ 4.) T-Mobile facilitates the grant of RSUs through its website portal NetBenefits, on which employees register with a username and password before navigating to the RSUs’ “Grant Documents” page. (Id. ¶ 5.) Employees are then shown three documents: a “Grant Agreement,” “Plan Document,” and “Mutual Agreement to Arbitrate,” all of which they are instructed to read before accepting. (Id.) The text below the Mutual Agreement to Arbitrate reads, “This Agreement requires final and binding arbitration of claims/disputes arising out of your employment relationship with T-Mobile. PLEASE READ IT CAREFULLY.” (Docket No. 18 at 5 (capitalization in original).) Below the three documents are two clickable prompts that enable the user to either accept or decline the award of RSUs, along with the following, separate notice: By clicking “Accept my award,” I confirm that I have opened, read, understand, and agree to the documents above, including the Mutual Agreement to Arbitrate. I understand those documents award me certain Restricted Stock Units and require me to resolve certain claims/disputes arising from my employment relationship with T-Mobile individually before an arbitrator, not a court or jury. (Declaration of Aaron Westlake (“Westlake Decl.”) (Docket No. 18-3) The agreement also contains Mass Arbitration Demand (“MAD”) procedures, which are triggered when fifty (50) or more claimants file arbitrations raising similar claims and are represented by the same or coordinated counsel. (Docket No. 18- 2, Ex. A, at 4.) In such instances, cases are resolved in “staged proceedings,” whereby the parties select a batch of cases “to be filed in arbitration and resolved individually” while remaining cases are delayed; arbitrators are instructed to resolve the selected cases within 120 days. (Id.) After this first stage is complete, a mediator oversees the remaining cases, with T-Mobile paying the mediation fee. (Id.) If the mediation does not resolve the remaining cases, the staging of fifty individual arbitrations repeats once more; after the second stage, fifty additional claims are allowed, which are randomly selected and for which mediation is optional. (Id.) Plaintiff was granted seven RSUs on February 25, 2024. (Ibrahim Decl. ¶ 7.) Plaintiff does not dispute that he accepted that award through the process just described, but he nonetheless argues that his claims are not subject to individual arbitration because he did not expressly assent to the agreement and because the agreement is unconscionable. (Docket No. 19.) When determining whether claims are subject to arbitration, courts typically decide two “gateway questions of arbitrability”: “‘(1) whether there is an agreement to arbitrate between the parties; and (2) whether the agreement covers the dispute.’” Gomez v. T-Mobile USA, Inc., No. 2:24-cv-01468 BJR, 2025 WL 3684175, at *2 (W.D. Wash. Feb. 19, 2025) (citing Brennan v. Opus Bank, 796 F. 3d 1125, 1130 (9th Cir. 2015)). However, these gateway issues “can be delegated to the arbitrator where the parties have ‘clearly and unmistakably’ manifested such intent’” through a delegation clause. Gomez, 2025 WL 3684175 (citing AT&T Techs., Inc. v. Commc’ns Workers of Am., 475 U.S. 643, 649 (1986)); see also, e.g., Kohler v. Whaleco, Inc., 757 F. Supp. 3d 1112, 1123 (S.D. Cal. 2024) (“[T]he Court considers, as a threshold matter, whether there is clear and unmistakable evidence the parties intended to delegate the arbitrability question to an arbitrator.”) Section 1 of T-Mobile’s Mutual Agreement to Arbitrate states that “[t]he Arbitrator, and not any federal, state, or local court or agency, shall have exclusive authority to resolve any dispute relating to the scope, interpretation, applicability, enforceability, or waiver of this agreement.” (Ibrahim Decl. ¶ 1). This language has repeatedly been recognized as “clear and unmistakable evidence that the Parties intended to delegate,” Grant v. T-Mobile USA, Inc., No. 2:23-cv-01946 MJP, 2024 WL 3510937, at *6 (W.D. Wash. July 23, 2024) (citing Rent-a-Center, West, Inc. v. Jackson, 561 U.S. 63, 66 (2010)); see also Gomez, 2025 WL 3684175, at *2 (same); Grant, 2024 WL 3510937, at *6 (same). Where a delegation clause is present, “[f]irst, a court must resolve any challenge that an agreement to arbitrate was never formed.” Caremark, LLC v. Chickasaw Nation, 43 F. 4th 1021, 1030 (9th Cir. 2022). If the court determines an agreement was formed, it then “resolve[s] any challenge directed specifically to the enforceability of the delegation clause.” Id. II. Whether an Agreement to Arbitrate was Formed Federal courts apply state contract law in determining whether parties have agreed to arbitrate. See Berman v. Freedom Financial Network, LLC, 30 F. 4th 849, 855 (9th Cir. 2022). Under California law -- which the parties agree applies -- an agreement to arbitrate requires that “the parties . . . manifest their mutual assent to the terms of the agreement.” Id. In the context of “online agreements,” courts consider whether “(1) the website provides reasonably conspicuous notice of the terms to which the consumer will be bound; and (2) the consumer takes some action, such as clicking a button or checking a box, that unambiguously manifests his or her assent to those terms.” Id. Plaintiff argues that he did not assent to the arbitration agreement because it was “deeply embedded within an RSU stock acceptance process” on the NetBenefits website, which “[did] not explicitly discuss the arbitration of employment disputes.” (Docket No. 19 at 6.) Two district courts have assessed this exact agreement and concluded that “the acceptance screen provided [the employee] with reasonably conspicuous notice of the Agreement’s terms,” and that “by clicking the button clearly labeled ‘Accept your Award,’ the [T-Mobile employee] unambiguously manifested her assent to the terms

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Ryan Diaz, an individual and on behalf of all others similarly situated v. T-Mobile USA, Inc., a corporation, and DOES 1 through 50, inclusive, (E.D. Cal. 2026).

Ryan Diaz, an individual and on behalf of all others similarly situated v. T-Mobile USA, Inc., a corporation, and DOES 1 through 50, inclusive (Ryan Diaz, an individual and on behalf of all others similarly situated v. T-Mobile USA, Inc., a corporation, and DOES 1 through 50, inclusive) — published by Counsel Stack Legal Research, free access to 12M+ legal documents.

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