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Discussion Starter · #1 ·

Will a 4G sim work in a 3G phone? I know it won't allow 4G but will the phone still work?

The reason I ask is that BT mobile are doing sim only deals for a 4G sim, unlimited calls and texts with 2GB of data for £12/month. I want it for a Iphone 4s but the 4s is only 3G.

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