Samsung Fascinate texting issue

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http://androidforums.com – My daughter's Samsung Fascinate (Telus) phone - but using Petro Canada Mobility SIM - was having texting glitches. She decided to do a factory reset, but now the problem is that she can only receive, not send ANY texts. All messages come in but trying to reply gets a "failed" message. I have tried to configure the APN many times using different settings I have found online, but nothing seems to work. Any suggestions are appreciated! (General)