Should I Lock My SIM Card?
A SIM PIN lock adds a useful barrier against physical SIM theft and account-recovery fraud, but it also introduces a real risk of locking yourself out if you lose the PUK. It is usually worth enabling when you carry a single SIM, have strong device security, and can recover the PUK quickly. If you frequently swap SIMs, share your phone, or cannot access your PUK, it may cause more problems than it solves.