TCL onetouch 4021

How can I insert or remove the SIM card correctly?

How can I adjust the volume when I am listening to music / playing a video / listening to radio / making a phone call?

Why does my phone show ‘No Service’, ‘Emergency call’ or ‘couldn’t register’?

Why is my phone always showing low power?

Why does my mobile phone turn off automatically?

Why couldn’t my mobile be switched on?

How can I transfer data between phone and PC?

Why is there no battery charging icon indicated on my phone when I plug it to the charger?

How can I make my phone battery last longer?

Why couldn’t my phone take photos or make videos?

How can I transfer files by Bluetooth?

How can I make factory data reset on my phone?

How can I check the IMEI number of my device?

How can I change my phone ringtone, remove power on/off beep?

Why doesn’t my alarm work?

Why do I receive text message sending/ receiving error?

How can I input symbol and change the input method?

How can I block a contact?

How can I copy all SIM card directories to phone contacts?

How can I set up speed dial?

Why couldn’t I make outgoing call and receive incoming call?

How can I forward incoming call to another phone?

How can I change font size on display?