Wireless service provider Verizon Wireless will refund 15 million customers after wrongly charging them for its data or internet services for a number of years.
In a statement the firm, which is co-owned by Vodafone, said most affected customers will receive credits or refund cheques ranging from $2 to $6, but some will receive larger sums.
Mary Coyne, deputy general counsel at Verizon Wireless, 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.
"As we reviewed customers accounts, we 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."
Most data exchanges were caused by software built into customers' phones, while other data sessions included web links that should not have incurred charges, said Verizon.
Verizon did not say what the total value of repayments would be, but according to a report by Reuters, refund payments could be $90m (£57m).