Telecom mobile phone is
Telephone band CDMA800
3G band CDMA EVDO China
If you have a special telecom mobile phone, going to Cambodia is moving bricks. Throw it away.
Please read the instruction manual of your mobile phone.
If you want to use it in Cambodia, you need to confirm the frequency band of the mobile phone.
If you have WCDMA 2 100MHZ, it means that your mobile phone can access the Internet with 3G in Cambodia.
If you have GSM900/ 1800, it means you can surf the Internet, make phone calls and send text messages in Cambodia.
Mainly frequency bands. .
If it's a telecom special machine. . Just moving bricks. . Throw it away. Or go to this frequency band (change chips)
That's it.