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. 
		
	  
	 - 
		  Do one of the following: 
			 
		  
			 - Go to 
				. If the data connection is off, tap the 
				On/Off switch next to 
				Mobile network to turn it on. 
			 
- Go to 
				Settings. If the data connection is off, tap the 
				On/Off switch next to 
				Mobile data to turn it on. 
			 
 
-  
		  Tap 
			 Mobile network or tap 
			 Mobile data.
		  
		
-  
		  Tap 
			 Access point names. 
		   
		  
			 Note: If your phone has two SIM cards, select a card first, and then tap 
				Access point names. 
			  
-  
		  On the 
			 APNs screen, tap  and enter the APN settings. and enter the APN settings.
-  
		   Tap 
			  and then select the new APN on the 
			 APNs screen.