A phone is bound to a phone item, not to a character.
Every phone is like a physical phone and can be used with all stored data.
You can give your phone to another player, and they can use it with all the data stored in it.
Supported inventories
An inventory with metadata is enough, but not all inventories are supported out of the box. If your inventory is not supported, see for a guide on how to implement it yourself.
- recommended
How do you enable unique phones?
To enable unique phones, you need to set Config.MetaItem to true in gksphone/config/config.lua.
Config.MetaItem = true
How do you set up unique phones with your inventory?
ox_inventory
Add the following to ox_inventory/data/items.lua. If you already have an item called "phone" and "iphone", replace the data.