T-Mobile has announced it will be increasing roaming charges for all customers outside the EU from 26 October.
The operator sent a text message to its customers to inform them of the changes last week, which will affect all pay as you go, contract and some business customers.
A steep increase in prices will take effect for calls made and received in Andorra, the Faroe Islands and Switzerland, where the price will rise from 55p per minute to £1 per minute.
The operator blamed the price increase on the fees paid to local service providers and the weak pound.
In June, the network increased prices for roaming in the EU by 6p per minute, to 44p per minute. At the time, the operator justified the change by saying it had to reduce the price of sending text messages on the Continent, in line with price caps issued by the EU.