Young mathematicians dive into the number line to discover decimals and how the numbers infinitely get smaller in between. They click the zoom button a few times and learn that the number line doesn't just stop at integers. Includes a...
But maybe you're not sure exactly what that means. An unlocked cell phone is one that is not tied into a certain carrier's network: It will work with more than one service provider. Most cell phones and smartphones are tiedâor lockedâto a certain cellular carrier, such as Verizon Wireless, T-Mobile, AT&T, or Sprint.
What locked and unlocked really mean. A phone is said to be locked if it can only be used with one mobile network (or group of mobile networks). For example, most phones sold by O2 on a monthly contract or pay-as-you-go will only work with O2 SIM cards.