I have just ported my phone no. over and the phone calls are fine. If I ring my mobile my ported no. works.
However if I send an imessage it comes through to the recipent as the original giffgaff no.
Any ideas please.
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you probably had your imessage app registered with the old number. you'll need to have this changed. read this https://discussions.apple.com/thread/3404451?start=0&tstart=0