Actually I having same issue like you also when first time upgrade from IOS 3.0 to 4.0, what i did is that, I sychronize the phone again after the update, now my phone seems to be better. You can try to synchronize your phone with itunes and if tht helps

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Added on August 16, 2010, 11:19 amanyway now i am confused, this thread becoming like a ip4 thread or actually it is dedicated to ios 4.0?

thank you for your prompt reply sir.

at least it gave me a slight idea. thank you again.

correct me if i am wrong, you sell a 32gb iphone 4 at 2,843.08 MYR(after conversion)?

Hey guys can a prepaid user to buy the micro sim from maxis center? 
or it only for postpaid user? 

Dear all iPhone masters and sifus,

I somehow stumble across a thread (not remember where and when), but some say Celcom network not so suitable with iPhone, including my iPhone 4.
At first I kinda doubt that, but lately, it happens to be kinda true. Whenever I turn off my 3G to preserve battery, when I make a call, for sure the call will drop in about 2-4 seconds after the call is picked up. Same happened on the other way around, when I received a call.

This doenst happen at all when I am on 3G network. Only happen when I'm on EDGE or GPRS. To say it's because I'm JB'ed my phone, I'm pretty sure I have done my homework by not JB'ed my iPhone 4 and after that try make a call using EDGE or GPRS network. Same happens.

Is it because of Celcom?

Thank you for any clarifications.

Cheers!