Signal is lost every 15 mins

That is the Service Providers tower signal being poorly received or being disrupted/blocked in certain areas.
Best change your service provider using number portability to a reputed one, viz., Vodafone, Airtel, Tata, etc.

may be you have purchased a cellular company handset like Airtel
it does not support other service providers like vodafone etc.
it will work only with that service provider.

check the default ring tone section.  if it has that companys ringtone in it , then use the same service providers SIM card...
it will work wonderfully... after all it is htc smart phone dont worry it will work.

before that do perform a hard reset so as to set to default settings.

You have purchased a htc handset which will work only on a particular service provider like AIRTEL OR VODAFONE, 
check your default internal memory ringtone section , whether it has airtel ring tone ....

then by that service providers SIM CARD , your hand set will work.

some times dual band sim cards dont work on triband service providers.handset

XDA, MDA, Vario, Dopod, I-mate, Qtek, Touch, Cruise, Orbit, Dual, Sprint Unlock Codes
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Please do not post request of code if your phone comes from one of these providers :

- Claro Brazil / Argentina / Guatemala / Dominican Republic / Chile (all models)
- Brasil Telecom and Vivo Brasil (all models)
- Movistar Chile and Equador (all models)
- HTC S621 Excalibur from Telcel / Movistar Mexico
- TIM Brasil (all models)
- HTC Touch HD from Bouygues France
- Telenor Norway (all models)
- HTC S730 from Hungary
- HTC from Digitel Venezuela
- HTC Touch Pro from Vodafone Romania
- HTC S710 and Vox from SFR France and NEUF Telecom France
- HTC HD from Play Poland Network
- HTC S420 from Vodafone United Kingdom
- HTC S621 from Vodafone Spain
- Qtek 9100 from Movistar Mexico
- KPN Netherland
- Vodafone and Movistar : Spain
- X02HT from Softbank Japan
- ALL Network from Portugal
- ALL Network from Austria

Because for these model/provider, the network provider changes the code of the phone after receiving them from factory, so code will not work

Please contact the helpline of DOCOM. They will tell you the sms settings. generally it happens automatically. I keep switching between Airtel and BSNL and have not faced such problem ever and it is over four years.

Airtel works well in other handsets in the same area but not in htc p3452

first u insert sim and start the machine and wait for open and massage will come automatic seting for this network u sould do yes and wait it will configure automatic seting on device and after setting device will ask restart and done restart that u can use internet surfing on your device if you have GPRS connection from service provider other wise massage will come remote computer has end this programm.

hi i am Arun using htc p3450 how to connect gprs in this phone with vodafone connection

Dear friends, before I begin with the details of Airtel Live, I wish to thank everyone at XDA-Developers for working on ROMs, fixes and the support that is being provided here.

Special thanks to dsixda for producing Onyx 3.0 because of which my HTC Touch Elfin (P3452) rocks even more.

Now regarding Airtel Live service: Airtel Live is free GPRS service that Airtel provides to its customer with a catch i.e. as per Airtel, you can only access http://live.airtelworld.com for downloading latest ringtones, games, wallpapers, videos etc.

If you call Airtel Customer Support to get Live on your HTC Touch, they tell you that it is not supported on any Windows Mobile phone and suggest you to go for Airtel Mobile office, full GPRS service for a monthly rental of Rs. 499 (USD 12).

After googling and fighting with Airtel, I managed to get the correct settings and I am able to run Airtel Live as well access most of the websites on standard HTTP protocol (SSL is not supported). Google Maps also works for me.

On Windows Mobile 6.x, the steps to configure are as follows:

1. Activate Airtel Live by sending the following SMS to 121: MASALA ACTIVE.
2. The service takes atleast 3-4 hours to get active. Restart the phone and resume configuring.
3. Tap Start -> Settings.
4. Select Connections Tab and tap Connections.
5. Select Advanced Tab, tap Select Networks button to bring up Network Management.
6. Under "Programs that automatically connect to the Internet should connect using:" drop down, tap the New button.
7. In the General Tab, type the name of the settings as Airtel Live
8. Select Modem tab, tap New...
9. Type the name of connection as Airtel Live, select the modem as Cellular Line (GPRS) and tap Next.
10. Type Access Point Name as airtelfun.com and tap next.
11. Leave username, password and domain blank and tap finish.
12. Select Proxy Settings tab. Tap "This network connects to the Internet". This should enable the next check box option.
13. Tap "This network uses a proxy server to connect to the Internet".
14. Type the proxy server as: 100.1.200.99 and then tap Advanced...
15. Tap HTTP, leave the server as 100.1.200.99 and change the port to 8080
16. Similarly tap WAP, Secure WAP and Socks, type the server as 100.1.200.99 but leave the port to defaults. These are optional settings.
17. Tap OK to close the Advanced proxy setup screen.
18. Tap OK to close the New connection screen.
19. The network management screen should now list the new connection you have created in the drop-down. Tap OK to close this screen
20. Tap OK to close the connection screen.

Now you are ready to fire your favourite browser. I have tested this on PIE as well as Opera 9.5 and it works for me.

If PIE reports "Request not authorized by the WAP Gateway", you will need to change the user-agent to anything you can think of using "Advanced Config" tool (thanks to dsixda for suggesting this). I had set it to HTCP3452_Mozilla/4.0 under Advanced Config -> Internet Explorer -> User Agent Custom Base.

I think Airtel has intentionally blocked Mozilla/4.0 user-agent on WM phones. It may be that they cannot restrict Windows Mobile based phones from accessing websites on standard HTTP. On other phones I had tried, I could not get other sites to work with the same settings.

Enjoy Airtel Live for free.

This is usual problem with HTC touch with Airtel Network.

Seek advise from the airtel GPRS executive in any Airtel office.

Last option is to take it to your HTC dealer for change in software. I'll fix the issue.