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Wi-fi calling and microcell towers

Is it true that if I purchase a cellphone  directly from the manufacturer that does NOT have any assigned carrier but IS listed as a compatible device and is sold at a higher price at the AT&T store...is it factual that I will be unable to make calls through Wi-fi when no cell signal is available? I

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2K

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I need to know if this device will work with AT&T 4g or 4g LTE please help

From my understanding ATT uses 700/1700/2100 for ltebut i have also read that it uses a paired 1700/2100 up and downlink systemthis phone listed below has a 1700 and a 2100here are the frequencies the phone uses"2G GSM : 850 / 900 / 1800 / 1900 and/or3G : 850 (B5) / 900 (B8) / 1700 (B4) / 1900 (B1)

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Can I put a prepaid sim in a locked at&t phone?

My at&t contract is up but still have my phone, it's locked, can I get a prepaid at&t SIM card and use it even though it's locked?

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4.6K

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Available devices

Why does AT&T not offer the Pixel or OnePlus devices.  People who use your wireless services want more options than just Apple or Samsung(Which you charge more for btw than unlocked phones).  Please give us more options than you currently offer.  Or at the very least please stop restricting certain

Questions

451

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upgrade phone question

will keep this as brief as possible... want to change a phone that is currently under an AT&T family plan. it is an old, OLD Apple iPhone 4s AT&T (MC918LL/A) is it as simple as just moving my SIM card from old to new one?where to go to get an unlocked phone that is COMPLETELY compatible to ALL AT&T

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