I need to replace my AT&T phone and am thinking of getting an "unlocked" phone from an eBay vendor. I assume that I can just insert the Sim card from my old phone and it will immediately start working on the AT&T network.
But what about other AT&T features that come on a phone that they sell? For example, holding down the "1" key on my phone connects me to my voicemail number. Is this setting on the sim card so that it would work the same on the unlocked phone?
Same thing for features like connecting to AT&T's "Media Mall". Would that be accessible from a keypress or menu?
So my main question is how different the operation would be using an unlocked vs. a AT&T specific phone.
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