Sending with Short Code Or Different Sender ID

Hi All

I am a beginner of PlaySms :

I installed & configured playSMS with Gammu and working nicely. aim using USB Modem ZTE

I receiving All sms with SIM Number i tried change send ID EX (MCSOE) or (51251) but not working all SMS coming with SIM Number +9xxxxxxxxxxx .

Please give Me your advice what should i do ?

Sender ID can only be modified when using an SMPP connection to the upstream provider as far as I know.