Most HTC phones are able to detect which mobile operator you're using based on the SIM card you inserted, and then use the preset Access Point Name (APN) to connect to your mobile operator's data network.
You can add a new (APN) when roaming or if you have difficulty establishing a data connection.
Important: Some mobile operators may not allow you to change the predefined APN or add new ones.
Go to Settings.
If the Mobile data connection is off, tap the
On/Off switch to turn
Tap Mobile data to open the
Network settings screen.
Access point names.
APNs screen, tap
and enter the APN settings.
and then select the new APN on the