T-Mobile has completed its acquisition of Ka'ena Corporation, the parent company of the direct-to-consumer prepaid wireless brands Mint Mobile and Ultra Mobile, as well as the wholesale wireless provider Plum.

The Un-carrier announced the completion of the transaction on Thursday, stating that the combination creates a "win-win" situation by pairing the complementary brands with T-Mobile's industry-leading 5G network. T-Mobile plans to maintain the distinct brands' entrepreneurial...