vB Easy Archive - Explain how-to on dual-slim phones?

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Explain how-to on dual-slim phones?
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Posted by: ziggie12345

This might not be the right place to ask this But=

Ok, I wouldn't mind buying a dual-sim phone but don't understand how it's used.

I put my T-Mobile & ATT sim card in a dual sim phone, turn the power on and then what?
Does it default ---to which service or do I have to select from somewhere? Do you get calls from either??

Is there a how-it-works web page somewhere to read...??