Creative Data Systems,

ributing employees may from time to time be re-enrolled unless they make an affirmative election at the time of the re-enrollment not to participate. Prior to January 1, 2026, the employer matching contribution was 100 % of the first 3 % of a participant’s before-tax and designated Roth contributions and 40 % of the next 2 % of before-tax and designated Roth contributions. Effective January 1, 2026, the employer matching contribution increased to 100 % of the first 3 % of a participant’s before-tax and designated Roth contributions and 55 % of the next 3 % of before-tax and designated Roth contributions. Participants' Accounts and Investment Options Each participant's account is credited with the participant's before-tax and designated Roth contributions, rollover contributions, employer m

ys 100 % vested in their before-tax, designated Roth and rollover contributions plus earnings thereon. Vesting in employer matching contributions plus earnings thereon is based on years of vesting service. Employer matching contributions plus earnings thereon vest 34 % after the participant completes one year of vesting service; and 100 % after the participant completes two years of vesting service. 4 Table of Contents Telephone and Data Systems, Inc. Tax-Deferred Savings Plan December 31, 2025 and 2024 Notes to Financial Statements A participant also becomes 100 % vested in employer matching contributions plus earnings thereon upon termination of employment after attaining age 65 or due to death or total and permanent disability (as defined in the Plan and determined by the disability ins

ous service with the employers or their 18 th birthday. Participation in the Plan is voluntary, however, any eligible employee who does not enroll on his or her own, or opt out of automatic enrollment, will be automatically enrolled in the Plan starting on his or her eligibility date (or as soon as practicable thereafter). On August 1, 2025, United States Cellular Corporation, a subsidiary of TDS, changed its name to Array Digital Infrastructure, Inc. (Array). Array is used throughout this report even when referring to historical periods. Contributions Participants may contribute to the Plan on a before-tax basis (before-tax contributions) or on a designated Roth basis (after-tax contributions). The combined before-tax and designated Roth contributions may not exceed 60 % of the Participan

8,658 Participant rollover 9,556 Employer 21,808 Total contributions 90,022 Total additions 368,247 Deductions from plan assets attributed to Benefits paid to participants 557,151 Administrative expenses 1,846 Total deductions 558,997 Net decrease ( 190,750 ) Net assets available for benefits: Beginning of year 1,779,896 End of year $ 1,589,146 The accompanying notes are an integral part of these financial statements. 3 Table of Contents Telephone and Data Systems, Inc. Tax-Deferred Savings Plan December 31, 2025 and 2024 Notes to Financial Statements Note 1 Description of the Plan The following description of the Telephone and Data Systems, Inc. Tax-Deferred Savings Plan (the Plan) provides only general information. Participants should refer to the Telephone and Data Systems, Inc. Tax-Def