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Phone sometimes randomly won't make outgoing calls

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http://androidforums.com – Hello all, I recently purchased a Samsung Galaxy S2 Skyrocket off of eBay (I have a month-to-month contract plan and cannot afford full-priced phones). Model number is SGH-i727. It is an AT&T phone, but I have Ultra Mobile as a carrier, which uses T-Mobile's network. Here's what happens: Occasionally and randomly, I will try to make a call, and the phone will show the dialing screen; however, it will not ring. The call will either drop, or the phone will switch to an in-call screen (as if the other person had picked up or the call had gone to their voicemail). But no one-person or vo (General)