The real explanation
The salesman was probably trying to exploit the granny and offered a paltry 100M connection for the price of your run-of-the-mill 1000M connection. (about £70 per month)
The salesman was probably trying to exploit the granny and offered a paltry 100M connection for the price of your run-of-the-mill 1000M connection. (about £70 per month)