If you are a T-Mobile wireless customer and facing any issue in receiving SMS or MMS then one of the problem could be wrong SMS service center number, update the correct number to send or receive sms/mms.
T-Mobile SMS Center Number
T-Mobile SMS Message Center Number is +12063130004 or +12063130003
How to Add T-Mobile SMS Center Number
To Add or Update SMS Message Center Number for T-Mobile see below steps
Go to Messages
Tap the 3 dots icon
Scroll to and select Settings then More Settings
Scroll to and select Edit.
Scroll to and edit the SMSC to +12063130004
and Ok Key