Possible cause 1: The sender is not authorized to switch. Check in the TC-MOBILE device whether the sender has the appropriate authorization.
Possible cause 2: New smart phones use the RCS or I-Message service instead of SMS. Make sure that none o...
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Possible cause 1: The sender is not authorized to switch. Check in the TC-MOBILE device whether the sender has the appropriate authorization.
Possible cause 2: New smart phones use the RCS or I-Message service instead of SMS. Make sure that none of these services is active when sending the SMS.
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