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Why can't Motorola ME525 send text messages after changing Unicom cards?

Is it a problem after the mobile card is replaced by Unicom card or Unicom card is replaced by mobile card?

Enter SMS Settings → SMS Service Center. If you are using Unicom card now, set the number to (+86 130 1)+ (area code) +(500). The mobile card is (+86 1380)+ (area code) +(500). For example, Beijing is+861380110500.