I have a Samsung Galaxy S3 from US Cellular and I'm trying to use it on a different carrier. I added the new SIM Card and I tried all the possible options to access the service menu and it always says "Mobile network not available". My phone model is SCH-R530U. Thanks.


Is your Samsung Galaxy S3 from US Cellular locked for US Cellular only? If YES, you won't be able to use a SIM card from a different carrier with it. You'll have to unlock the phone first so that it allows SIM cards from other networks.

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