Why won't my iPhone 4s send pictures in i Message?

A few weeks ago my phone started having trouble sending photos through iMessage. I can send texts but photos won't work. It takes forever and once it finally sends it pops up unable to send and then i have to do it via text message.

Probably a carrier issue

Here's a good answer from Apple: https://discussions.apple.com/...0#23978810

Settings > Messages > turn on MMS Messaging

Settings > Cellular > turn on Cellular Data

The article has more troubleshoot tips if these don't work.

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