UScellular has notified regulators of plans to lay off more than 4,000 jobs across the US.

The layoffs are set to take place as part of the company's deal to sell its wireline operations to T-Mobile.

The regional mobile carrier agreed to sell approximately 30 percent of its wireless spectrum to T-Mobile last year for $4.4 billion.

In total, UScellular said it would cut 4,100 jobs across the company, with the process set to begin on June 2, 2025, according to a letter published by ABC17 Missouri.

This is the same number of employees that UScellular noted it had in a filing at the end of last year.

The company did state that it has made arrangements with T-Mobile to offer employment to the majority of its employees.

"T-Mobile has not made final employment decisions. They are committed to offering employment opportunities to at least a majority of UScellular associates," said UScellular in a statement.

DCD has contacted T-Mobile for comment.

T-Mobile has previously said it expects the deal to complete midway through this year.

UScellular has previously told the Federal Communications Commission (FCC) that the deal is essential for its future.

As part of the agreement, UScellular will retain ownership of its other spectrum plus its 4,400 telecom towers, with T-Mobile entering into a long-term arrangement to lease space on at least 2,100 additional towers being retained.

UScellular is one of the biggest regional providers in the US, outside of the three traditional big carriers (T-Mobile, Verizon, and AT&T), but has struggled to compete with the bigger names.

The company serves around 4.5 million customers and operates in 21 US states.

UScellular also struck separate spectrum deals with AT&T and Verizon for $1bn each last year.