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Why can't I send a text message with 86 when Apple 5 has a locked version?

Because if you leave the contract place with the lock version, it means breaking the contract and people won't let you use the mobile phone function. This is the essential difference between the locked version and the unlocked version, and you should know it before buying it. Although a locked version is cheap, unlocking it may cost more money. And after unlocking, the performance of the functional system is very unstable. So most people don't buy locked versions.