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Are both phones with the same company? Are both SIM cards active and working?
If both are with the same company, you may have an incompatable phone or incompatable SIM. 2G SIM cards will work on 3G phones (mostly) but 3/4G SIM cards are not compatable with 2G phones.
If the SIM cards are with different companies, you'll need to unlock the phone in order to use a SIM from a different carrier. Unlock codes can be purchased here: http://www.unlockitnow.com
unlock phones are so unperdictable...there may not be a fix for this issue..other then getting an AT&T phone....and even if u are able to get it to start working again more then likely u wil continue to have many more isses..mainly becuz of the network changes..for example....using 3g and 3g only...last year the AT&T network was stil using both 2 and 3g network and there was even a few 2g SIM cards being sold in stores...now it almost all 3g..which of course complicates many things...even if u own a 2g AT&T phone a 3g SIM card can be and will be used on that phone....with unlock phones running on the 2g network the issues with not having a SIM card where possible...it was still unstable when wanting to use data services....but voice services were possible...now with everything going 3g...its makes things alot more complicated with AT&T if using a phone without SIM cards...if ur phone has the fuction to beable to shut off 3g networking and run on 2g.(like the apple iphone has) then try that....good luck
We provide iUnlock Solution : step-by-step tutorial with latest softwares in order to easily unlock/jailbreak your iPhone 2G/3G and iPod Touch 1G/2G.All you have to do is to access iUnlock, download given software and follow the instruction of tutorial. iUnlock is fully compatible with 2G/3G iPhone and iPod Touch 1G/2G with latest firmware 2.2.1.Win XP, Vista and Mac are totally supported.
Jailbreaking your iPhone to 2.2 is going to mess up your phone. I've got a jailbroken 2.2 iPod Touch and it's ok - a friend of mine also tried to jailbreak his iPhone to 2.2 and lost connections as well.