In this case, to "unlock the phone" just means to enter the password or to reach the homescreen where you can launch apps. If you have a SIM card from another carrier lying around, try putting it ...

(1) A cellphone that operates on any cellular carrier's network that supports the same air interface (GSM or CDMA) and frequency bands built into the device. See SIM card, SIM lock, jailbreaking ...

There are two types of phones—those locked to a carrier and those free to use whatever carrier they want. There will come a time when you need to know which one your phone is. Thankfully, you'll ...