Touch Your Heart

Why does my signal indicator shift from 4G to H every time I make a phone call?

The signal is unstable. What should I do?

What is VPN and what is the use of VPN?

Can I surf the Internet while I am talking on the phone?

Can I make phone calls without SIM card?

The call ends automatically when talking on my iQOO phone. What should I do?

How to check the phone Mac address?

Can the MAC address be changed?

Why is my phone bill charged gratuitously?

Why does my phone make phone calls automatically?