Sifus-sifus sekalian, need some help regarding my iphone.
iPhone Generation : 3G 8G
Unlocked? (or Part Number): Official Unlocked (S'pore set)
Current Firmware : 3.1.3 (7E18)
Current network: Celcom (P148 data plan)
iTunes Version : 9.0
PC/MAC : PC
Jailbreaking software : Used to JB using quickPWN (b4 v3.1.3), now tarak JB
Problem Encountered : Iphone will lag on several occasions such as:
- When clicking on 'Home Button' and slide to unlock , the "Slide to Unlock" slider will hang for a few seconds b4 responding.
- Keyboard will lag when typing SMS.
- Lag when sliding apps from left to right (and i have only 3 pages

)
- Lag when closing apps.
Another (even worse) problem is the dropped calls and incoming call failure problem.
- Calls will drop suddenly when on the phone (mostly when just pick up - sometimes tak sempat say Hello sudah drop >< )
- Incoming calls cant get thru A LOT of times. Friends and family describe as - when calling me, no dial tone. Have to try a lot of times baru get thru.
- SMSes will only reach me a few hours after ppl send, sometimes wont receive.
T_T HELP!
Steps Taken So Far :1. Problems happened in 3.1.2 (WITH JB) - so i restored my phone and upgrade to 3.1.3 WITHOUT JB. - both problems still happen.
2. I tot dropped calls due to celcom 3G line not stable, so i disable 3G on the settings, but both problems still happen.
Other Information/Remarks :1. The lag problem happens intermittently (a lot of the time, but not ALL the time), the dropped call problem happens ALL THE TIME, no matter WHERE i go or WHEN. Sim card problem?
2. My HOME button is kinda insensitive (not responsive). Is the problems all bcoz of this?
Very the

Please help

. anybody with same problem? I dun wan to throw my beautiful iphone away.