At Target Mobile, you can upgrade your phone for AT&T. Verizon, or Sprint. I haven't seen pushiness in the sales people (at least in Georgia).
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Re: Sync Microsoft exchange calendar with S6
I used the app type mail, for my work email, when I had a Note 4. Hope this helps.
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I played Hearthstone on a Note 4 and never experienced that. I know not a S6, but I wanted to respond to your question.
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