Mobile phone can't send text messages. I'm Sony Ericsson, and I've been waiting to send it.

Turn off the phone and re-insert the SIM card to see if it is caused by poor contact of the SIM card! ! Check whether the cell phone signal is normal! ! If the signal is normal, I guess there are too many people texting at Christmas, which leads to the failure of the mobile network! ! The network will be normal in a few days, so there should be no problem! Please consult your local operator for details! !