This reminds me of an anecdote from a local (European) telco: A customer called the customer support line because their monthly invoice was way higher than in

This reminds me of an anecdote from a local (European) telco: A customer called the customer support line because their monthly invoice was way higher than in the previous months. They had 3G data access modems/SIMs and a fairly standard contract. The CSR searched their record and found that they had a lot of roaming data fees (really expensive if you don't have a special contract). The customer then replied "I see. Well, we use these data SIMs in special collars to monitor some bears... One of them went abroad."