iPhone 4 calls to voicemail issue?

holmesla327

New member
So I've had my phone a couple of weeks and most the time people cannot call me without it going straight to voice mail. I've tested this myself from other phones and it seems that when I am on 3G it works fine, but when I am on edge, this is when it goes to my voicemail. Is this a problem with just the iPhone, or will I have the issue on any AT&T smartphone? I am not sure what to do at this time.
 
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