“I have an AT&T phone (inserted an AT&T sim), but it is very SLOW. Can I insert the sim in a Galaxy S21 5G phone and continue to use without any glitches/issues?”
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Hello, John. We are really sorry about any performance issues you are having with your Galaxy S21 5G. We would love to get more information to assist you. Please reach out to us on Facebook at (http://m.me/samsungsupport) or Twitter at (https://twitter.com/messages/compose?recipient_id=18768513). We look forward to speaking with you. ^Kayla
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