@Willaug56 'ou used to be able to receive and send picture, but was it on another phone? or you have the same phone?
did you have Mobile Data enabled?
If you have already enabled Mobile Data, try again sending a smaller picture
If still fails, you can try to Reset Network settings and see if it helps (Please note resetting the network setting, your saved Wifi connections will be gone too and you have to rejoin those Wifi networks)