MMS sending problems among Android smartphones like the Moto X4 are generally attributed to software bugs and glitches. Just like what usually happens after installing a faulty update, be it a messaging app update or Android firmware update. Aside from faulty updates, there are also other factors that can inflict similar issues with the Moto X4 MMS function.
Do you own a Chinese Huawei phone which cannot run any Google apps. I understand the pain you constantly feel after buying Huawei Chinese phone. We as a user are pissed off when popular companies restrict the use of their product because of the controversy between them.
Most probably this equipment is electrical equipment like fan, TV etc. To flow current from a circuit it must require a close path loop. If switch is OFF, that means circuit is open and current cannot flow through the conductor and equipment is de-energise OFF state. To make it energise, we have to turn ON switch, it makes a complete circuit and close path.
OK thanks. Now when you say "try using Samsung's official app", do you mean Smartswitch for Windows or Kies 3 or something other. So sure enough I locked myself out of my phone after rooting don't ask only access was download mode, so I tried SmartSwitch and it got me back up and running. So thank you very much for the tip "undercontr".