Unlocked: When a phone is unlocked, it is free from any single carrier service. An unlocked phone will accept any carrier sim card.
Carrier Locked: No other sim card will work besides the one specified carrier.
Financed: Phone is involved in a monthly payment contract.
Bad ESN: You can't activate your phone on your current carrier. It can happen if the phone has been reported lost/stolen or it has an outstanding balance owed on the account if financed.
IMEI: Stands for International Mobile Equipment Identity. It's a phone's special number that we use to check if it's stolen. Think of it as your phone's finger print.
Digitizer: It's the layer under the glass on your screen that senses touch. Aka the touchscreen.
LCD Screen: It's the part of the screen that displays the images that you see.
Glass Screen: It's the glass layer that is on top of the digitizer and lcd. It's there to protect it!
GSMA: It stands for Global System for Mobile communications Association. It's who the phone carriers report stolen phones to.
4g LTE: LTE stands for Long Term Evolution and is 10 times faster than 3g networks.
Lidar: It's a method for measuring distances by illuminating the target with laser light and measuring the reflection with a sensor.