Severe battery drain after AT&T sim card replacement.

Up to a point, my wife's original iPhone worked fine. A week ago, it stopped connecting to the AT&T network, and after a call, we found out that someone at a retail store made an error when registering an upgrade to a 3g, and somehow started the process on my wife's account, which killed the sim card. I ran to the local AT&T store and they replaced the sim card for free, and all seemed well.
However, since then, her phone has been suffering from a severe battery drain. I have made sure that wi-fi, bluetooth, and location services are turned off, but it will not last 10 hours in standby mode after a full charge anymore (she makes no calls during the day - just leaves it in her purse on standby). I have tried a full restore of the software/firmware, and she is running the latest 2.02. Is there anyone who can help?

Sorry, no, that's not the issue. First, it's a 1st gen iPhone. Second, as I said in the question, I've already turned off every other unnecessary service on the phone. Basically, it's sitting in her purse on standby during the day, just as a phone, and draining from a full charge to nothing in about 9 hours. The problem only started after getting a new AT&T sim card. I'm wondering if anyone else has heard of this problem.

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