I purchased a 64gig Verizon Iphone 5 from somebody off Craigslist (800 dollars)
and cut the Straight talk micro sim down by hand with scissors using the another nano as a template and help from the internet and i have everything working perfectly. Imessage, Facetime etc all ok.
The sim fits if you cut correctly, it doesnt need to be made thinner. It will fit.
Great to be able to use the Iphone 5 with Straight talk. No LTE of course but i dont care about that, for me 3G is fast enough.
The Verizon Iphone is the one you should all get as they have made theres fully unlocked even under contract.
If you guys or girls have any questions would be glad to help.
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Used unlockit.nz for the APN settings.