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Sunday, November 11, 2012
iPhone 4 suddenly dropping calls | iPhone and iPad Forums at everythingiCafe
there are some troubleshooting steps:1. Settings > General > Reset > Reset Networks Settings 2. Call AT&T or go into a Corporate AT&T Store and ask for a replacement SIM. Make sure you specify that it's a micro SIM. 3. If neither of those work, you could try a restore to factory settings.