Last week i bought 2nd hand iPhone 2g 8GB from internet. After use it it for 2 days i noticed dat even when i got coverage in my iPhone i cant receive/send call and sms except when im in 3G area. I already upgrade/downgrade jailbreak and unlock using ra1n and redsnow but still got the same problem. Also had tried maxis,digi,celcom but still got the same result. I send my whole day 'Google'ing around internet but still dont get any info so decide to post here . Hope can get same advice at here .