In plain English
The important point is that the number does not change. The same mobile phone number you already use remains the one you go on using.
In context
Here, "keep your number" communicates that there is an option to continue using your existing mobile phone number.
- Situation
- Porting numbers, activating SIM or eSIM, replacing devices, and changing account details
- What it communicates
- offers the option to continue using the existing number
Meaning limits
By itself, the term says only that the existing mobile phone number continues to be used, not how or whether that will be arranged.
Examples
“After changing to a new mobile service, she kept her number.”
“People can keep their number if they switch to another mobile plan.”