Postpaid Phone Net Additions: Measuring Wireless Subscriber Growth

Postpaid phone net additions measure the net increase or decrease in an issuer's postpaid phone customer or connection base during a period.

A simplified operating bridge is:

1Postpaid Phone Net Additions
2≈ New Postpaid Phone Connections
3- Postpaid Phone Disconnects
4± Issuer-Defined Adjustments

The metric is useful because it separates wireless customer-base growth from revenue growth. A carrier can grow service revenue with weak net additions if pricing or per-account monetization rises, while strong net additions can still be expensive if acquisition promotions are unusually heavy.

Net additions are not gross additions

Gross additions count new activations. Net additions subtract customers or connections that leave.

Verizon defines wireless retail postpaid phone net additions as additional retail postpaid phone connections less phone disconnects, net of certain adjustments. T-Mobile similarly explains that higher postpaid phone net customer additions can reflect higher gross additions partially offset by churn and deactivations.

That makes churn a direct companion metric rather than a synonym. Postpaid Phone Churn measures the rate of customer loss, while net additions capture the combined result of additions and losses.

The customer or connection definition matters

Carriers do not always count the same unit.

A reported postpaid phone metric may be based on:

• customers;
• connections;
• subscriber identity modules;
• consumer versus business accounts;
• retail-only versus broader wholesale populations; or
• issuer-specific rules for temporary disconnects and service restoration.

T-Mobile, for example, generally defines a customer as a SIM number associated with a revenue-generating account. Verizon reports retail postpaid phone connections. Those labels are close enough to invite comparison, but they are not automatically identical statistical populations.

Acquisitions and base adjustments can break the simple bridge

A change in the ending customer base does not always equal reported organic net additions.

T-Mobile's 2025 filing separately disclosed millions of customers acquired with UScellular and described base adjustments used to align customer-counting policies. Acquisition additions can therefore increase the ending base without representing ordinary period gross additions.

The clean analytical bridge is:

1Ending Base
2≈ Beginning Base
3+ Organic Net Additions
4+ Acquired / Divested Customers
5± Base Adjustments

Do not force every reported base change into organic net additions when an issuer explicitly separates these items.

Strong net additions are not automatically better economics

Subscriber growth can require higher:

• handset promotions;
• trade-in subsidies;
• commissions;
• advertising;
• device financing support; or
• channel incentives.

AT&T's 2025 filing, for example, reported more than 1.5 million postpaid phone net additions while also discussing equipment revenue, selling costs, promotions, and churn. The quantity metric should therefore be read alongside Postpaid Average Revenue per Account, churn, margins, and cash investment.

A simple example

Suppose a carrier activates 1.8 million new postpaid phone connections and loses 1.4 million during the quarter, with no other adjustments:

11.8 million gross additions
2- 1.4 million disconnects
3= 0.4 million net additions

That 400,000 figure says the phone base expanded. It does not reveal how much the carrier spent to acquire those customers or how valuable the customers will be.

Filing examples

AT&T reported 1.551 million postpaid phone net additions for 2025. T-Mobile reported 3.294 million postpaid phone net customer additions for 2025. Verizon's filing defines the metric using postpaid phone new connections less disconnects and separately reports broadband and other connection categories.

Sources:

• AT&T 2025 Form 10-K
• T-Mobile US 2025 Form 10-K
• Verizon 2025 Form 10-K

Bottom line

Postpaid phone net additions measure net wireless phone-base growth, not gross activations, revenue growth, or profitability. Preserve the issuer's customer-versus-connection definition, disconnect methodology, acquisitions, migrations, and base adjustments before comparing carriers.

Explore more topics in the Financial Research Encyclopedia.