My 3GS iphone always go into 'network lost'!

my 3GS iphone is constantly going into network lost and 'no service'. Each time that happens, I have to go through a lengthy process of re-starting the phone which is painful! Additionally, the call drops while i am on conversation. My colleagues always complain that they cant call me the first time because the phone appears to be off but get thru after the subsequent attempts.
I checked with my service provider (Celcom) and they said there is no problem with its setting. I checked with the other service provider that I bought the phone from (Maxis) and they said that there is nothing wrong with the phone as well. I am lost.
I am a heavy user of data (I hv data unlimited package). My Yahoo msg and other online applications are turned on most of the time. I am not sure why I continue to have this problem. Recently, thinking that the service provider coverage could be bad, I changed the phone, but for a week, but I never had such problem.
Anyone faced similar problems and is there a solution for this? Thanks much

Hi newyorker2014,
I apologize, I'm a bit unclear on the exact nature of your issue. If you are no longer seeing the app in question on your iPhone, but it is showing as purchased on the App Store, you should be able to redownload it directly. You may find the following article helpful:
Download past purchases
http://support.apple.com/kb/ht2519
Regards,
- Brenden

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