My iphone 4s isn't sending pictures?

It was working this morning but now its not? I have mms and cellaur data turned on. And inrest my network settings.

You have to call your network to resend the network settings, perhaps it was accidentally resetted. Try to put a new sim card to prompt the network or contact them to ask to send the mms settings and save it, sometimes you have to write it down. Then type it on network settings,

I read that you have mms on, but it is useless without the settings basically its numbers or codes, domain name that will refer to network.

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