Why can't I send pictures over Wi-Fi on my iPhone 5s?

I just got my iPhone and I can't send pictures on my messages. It has it's ios 8.1.1 i'm on at&t carrier. I've already tried to rest network so far

Maybe you have MMS messaging turned off in the SETTINGS, MESSAGES

It's because you use AT&T. With this carrier, text messages need to use the data connection to send MMS, not Wi-Fi (and this costs you money because it eats up your data)

Other carriers like Metro PCS and Sprint allow it no problem. This is one of many reasons why AT&T can suck it.

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