Are you on wifi? They won't send unless you're connected to 3G/4G.
I am here to help! What happens when you attempt to send multimedia messages? any error messages? does this occur everywhere? Let us know.
I have this same problem can not send or receive mms unless the 3g is connected. why? no matter where i am it will say unable to send will send when service is available. and to receive it will recieve but not download just says try again later. this is my 1st try at smart phones and so far im no happy
also whenit says will send when service is available it never does send it will stay there hung up sending...
They will (should) send on any data connection, including wifi. Go into ur settings and make sure that u have cdma/lte checked and that u also have mobile data checked. If ur status bar isn't showing one of the following, 3G, 4G, LTE, or Wifi bars.. u can't send a MMS. All MMS are considered, use and require data usage. Hope that helps 😉