In plain English
It means extra internet usage for a phone plan when the included amount is not enough. It is something a customer can buy in addition to what the plan already provides.
In context
Here, "data add-on" names an optional extra amount of mobile data that can be bought on top of the data already included in the phone plan.
- Situation
- Choosing mobile plans, allowances, roaming, fair-use, and add-ons
- What it communicates
- names an optional extra for data in the account app.
Meaning limits
The term by itself does not say how much extra data is involved or what terms apply to buying or using it.
Examples
“After the data included in her mobile phone plan ran out, she bought a data add-on.”
“He chose a small data add-on rather than changing his plan.”