Iphone 3gs for Straight Talk: Can't Make or recieve phone calls/texts but data works fine

I recently ordered and installed the sim card that straight talk is now offering for smartphones on their website and put it in my Iphone 3gs which was originally with AT&T. I followed all the steps and set up the APN and at first it worked fine. But then it started to not deliver texts or recieve them (even though i was in my house with wifi and had full bars). Next came the calling issues where I can't make or receive calls. I have to keep switching over to airplane mode and then switching back but this works for only a few minutes and then it stops working again. I seem to have the opposite problem of everyone else because my data and apps work perfectly fine. I did the exact same thing my dad and brother did with their iphones for straight talk and theirs work great. I have no idea what's going on with mine. I bought this phone to be a phone and it doesn't work. Does anyone know what to do to fix this problem?

Thanks!

Rachael

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You can purchase Straight Talk through Hildretech. The cost of the SIM card is $59.99, including the first month of service. The cost of the plan is $45 for each additional month, and includes unlimited talk, text, and data.

If you have any questions, feel free to contact us by sending an email to consultation@hildretech.com.

The website sure loads so slowly.. what is this business about Straight talk anyway?