a) Check your device memory availability as it might be full
b) If the device also can't send or receive MMS, please go to “Settings”->“Cellular network” or "SIM card & mobile network” -->Click the network name >“Access Point Names”, check the MMS APNs and contact your network operator to check the MMS service availability.
c) Check whether you have good signal reception. If the signal is poor, move to an open area with a better signal and try again.
d) Check whether your credit has run out. Top up your credit to avoid disruption to messaging services.
e) Try to reset or update your device. (Refer to Q How can I perform a factory reset on my phone & Q How can I upgrade my device).
If the previously described options do not help, you can contact our hotline or repair center to get more professional technical assistance. Find the hotline or repair center information from the TCL website or APP “Support Center”.