If you purchase a locked phone, you will usually only be able to use it with the carrier that is offering the phone. While this can limit your flexibility, the major advantages of buying a locked phone include a lower upfront price, built-in payment plans, and the stability of having a regular cell plan. Some carriers will also offer regular upgrades to your phone, allowing you to keep up with the latest version of your Android or iOS device. When you buy a phone from a mobile carrier like AT&T, Verizon, or T-Mobile, the device is restricted to that carrier's network and it’s called a lock

Yes, you can generally put any SIM card into an unlocked phone, as long as the phone and the carrier's network are compatible (GSM or CDMA). Some carriers may have restrictions or limitations on using their SIM cards in certain devices, even if they are unlocked. However, an unlocked device typically gives you the freedom to select the provider of your choice and choose the plan and pricing that fit your budget and needs. This flexibility allows you to switch carriers easily or use local SIM cards when traveling. Just make sure the SIM card is the correct size for your phone as different phone

Unlocked and locked phones differ in how they work with phone carriers. Unlocked phones can be used with any carrier that supports the phone's network, letting you change carriers or use different SIM cards when traveling. Locked phones work with a specific carrier, usually through a contract or payment plan. They often cost less upfront because carriers offer a better price in exchange for using their service. However, you can't switch carriers or use other SIM cards without unlocking the phone. To unlock it, you may need to contact the carrier, pay a fee, or wait for a certain time in your