US telco Verizon Wireless confessed that it had overcharged customers up to $90 million and was to offer refunds to some 15 million subscribers.
The outfit is being investigated by the US regulator, the Federal Communications Commission, ovre the charges which rerlted largely to data use on customers' mobile phones.
In a statement, the firm said: "In October and November, we are notifying about 15 million customers, through their regular bill messages, that we are applying credits to their accounts due to mistaken past data charges. We will mail former customers refund checks. In most cases, these credits are in the $2 to $6 range; some will receive larger credits or refunds.
The firm said it "discovered that over the past several years approximately 15 million customers who did not have data plans were billed for data sessions on their phones that they did not initiate. These customers would normally have been billed at the standard rate of $1.99 per megabyte for any data they chose to access from their phones. The majority of the data sessions involved minor data exchanges caused by software built into their phones; others involved accessing the Web, which should not have incurred charges."
When you have millions of customers a few bob here and there can make a big difference to your bottom line.
It shows you should check you bills thoroughly. Mobile phone communications are enough of a rip-off as it is.