In plain English
It is a fresh card issued for a mobile line that already exists. The old card for that very line is being replaced, not a different line being started.
In context
Here, it names the option for getting a new SIM card that replaces the current card on the same existing line.
- Situation
- Porting numbers, activating SIM or eSIM, replacing devices, and changing account details
- What it communicates
- names the SIM option for continuing service on the same line
Meaning limits
By itself, the term does not say why the current card is being replaced or anything beyond that same line.
Examples
“The shop issued a replacement SIM for his existing mobile line rather than opening a different line.”
“Select replacement SIM when you want a new card for the line you are keeping.”