IPhone 4 not sending texts, but will send picture messages?

It starts sending, pauses, than gives the error message, red circle thing by the message. But picture messages send just fine… How do I fix this?

It's probably a software error so just do a restore. I would try rebooting the device before you do a restore.

Try the following it worked for me.

Settings --> General --> Network --> Cellular Data Network Scroll to the bottom of the page and select 'Reset Settings'

Or

Settings --> General --> Reset then select 'Reset Network' this may well work but you will lose all data relating to your Wi-Fi networks too so it can be a bit of a pain.

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