Subscribers to Three mobile are set to face disruption to their services this weekend, as the mobile operator prepares to upgrade its billing systems.

From 6pm Saturday 13th July until 8am Monday 15th July there will be a number of services cancelled for both pay-monthly and pay-as-you-go users.

Three sent a text to its customers yesterday afternoon detailing the plans, which state that anyone on the network that is abroad this weekend will not be able to use their phone to access the internet - this includes access to apps and maps.

Pay-as-you-go users will not be able to top up their phones or buy add-ons, make any phone calls and texts when abroad, check their balance using the My3 app, make international calls and texts from the UK, as well as make calls to some premium rate numbers.

Three said: "If you're low on credit and you think you'll need to top-up this weekend, please top-up before 6pm Saturday 13th July to make sure you get your credit in time."

Pay-monthly subscribers will not be able to access My3 to check their account details, make a payment or check a bill, buy add-ons, text premium rate numbers, and will not receive credit limit alerts.

Computerworld UK contacted Three for comment but had not heard back at time of publication.

This will be the second disruption to Three mobile users in recent weeks, after subscribers were angered by a network outage in June that left many without access to data services over night.