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This device is T-Mobile's version of the Samsung Galaxy S II. It was released in October of 2011. It was the first Galaxy to include T-Mobile's new expanded 4G network.

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Can I install a custom rom into this phone?

It has gingerbread which is not as stable as android 5 or 6.

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You can. Check forums.xda-developers.com for roms and rooting instructions.

This is an S2, so this gets complicated as each custom operator had a custom variation in the phone itself.

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