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Level 1: Cadet

Unexplained sms on data only sim

Hi - I have a data only sim and it is inserted into a modem that we use for internet. On my first bill it shows 612 sms sent over a 5 hour period on 16 July? This was not the first day we used this. The sim card has only been in the modem and never in a phone. 

 

Why is a data only sim even capable of making sms?

 

What could be the cause of the unexplained sms?

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