How to make my factory unlocked iphone 4 send mms messages?

I have a factory unlocked iphone 4 on metroPCS and I can't send text or pic messages in a mms message / group messages.
How can I fix this so I will be able to send mms messages?
I have already taken my phone to metro and they can't fix it.

my APN is set up as fast.t-mobile.com

My phone is not jailbroken

Ask a phone shop

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