Link. “Verizon will unlock your iPhone 5 after 60 days for overseas use with cheap local SIM cards, whereas AT&T’s policy is never to unlock until your contract is finished … the LTE chip in the Verizon iPhone 5 supports 5 frequency bands, 3 of which are used by several overseas carriers, so if you choose your overseas partner carefully, you could do LTE overseas, whereas the AT&T iPhone 5’s LTE chip supports only on 2 frequency bands that are pretty much USA-only.”