Default settings received from Airtel won’t work with old HTC Wildfire, you need to follow the procedure below to enable mobile internet on HTC wildfire.
First you need to charge your phone with Rs. 98 so that you get 1 GB data transfer which is valid for a month. Once its recharged , have the following settings as below.
Goto Settings –> Wireless networks –> Mobile network
Set the Access point name
Select Access Point name and click on Menu button.
Select New APN
Set Name = MI
Select APN and set it as airtelgprs.com
Click Menu and save.
Restart your device.
Airtel Mobile internet helpline number : 12118