Cheap prepaid iphone 5 plan?

I bought an unlock iphone 5 from apple, I wanted to know if I could use the 30/per month plan tmobile offers? When I look through their website, the only prepaid plan I see it's the "simple choice plan"for 50/per month. Also do they have the nano sim card? Are they a %100 contact free and no hidden fees? I live in New Jersey so my taxes are %7. Also how much will i paid for the first month, example activation fee?

Straight talk $45 unlimited everything

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