By setting the sending and receiving MMS on the Galaxy S5 (or other high-end phone), we can have the message “unable to establish a wireless data connection”. It is necessary to update its profile in relation to the mode of sending data. You have this message because it is a phone intended for the US market and non-European or Asian.
To do this reparamétrer your phone (see the MMS sending setting guide with your mobile network provider).
Then type the following thing in the call part: # # 873283 #
Send it and the MMS should now be able to be sent and received.