As others have said, data usage depends upon your individual choices. One thing I'm sure of is that very few people use the full 100 GB Volvo supply via Vodaphone. The cynic in me sees that as a marketing ploy by Vodaphone.
Whilst the sim is 'active' you can show the amount of data remaining. I'm not too sure if this will work on an expired sim. I suggest you get a limited data sim, say 12 month, 12Gb (your choice) and monitor usage over a period to establish a 'norm'
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