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T-Mobile sets a default daily messaging limit based on your Trust Score. Once you reach the maximum limit, you will receive Error 30027.
T-Mobile daily message limits based on Trust Score
T-Mobile limit is applied at Brand Level and is based on the sum of outbound SMS segments and MMS messages on a 24-hour basis and resets every midnight (Pacific US Time).
T-Mobile message limit (SMS segments + MMS) outbound
75 - 100
50 - 74
25 - 49
1 - 24
Read more about US A2P 10DLC Error 30027.