IPad3 4 G version need not unlock global can be used

IPad3 4 G version is have a lock or no lock? According to a user actual proof, 4 G version of the new iPad3 case has a lock on the machine, interchangeable 4 G SIM card. Although different frequency can lead to 4 G CARDS are not universal, but the user name after the proof, he bought a Verizon's 4 G iPad version, but he can use AT&T's small card, and after test, Internet speed can reach HSPA + standard. Only need to change in card under the network Settings, do not need to escape or to unlock.

Based on the previous HSPA iPad 3 G version also don't need to unlock, but because the Verizon EVDO 3 G network system users can't change other operators card. But the new iPad3 case mobile phone network chip already internationalization, all can support HSPA + standard network.