Login into your Tesix MyAccount
Select Tab for "Your Services".
Note: If you have multiple line, be sure you are changing the device under the correct line by selecting the phone number.
Scroll to bottom of the screen until you see Device
Select "Change device or SIM"
You can also connect with Tesix Via Chat or email with the following:
- Account Number
- New ICCID (SIM card number)
- or New IMEI