Update, 13:30 GMT: Ars understands that EE suffered a problem with its servers, which may have affected other mobile operators.

EE refused to deny this claim when approached by Ars. A spokesman simply told us that "investigations are on-going".

BT declined to comment on this story.

Original story

EE and O2 customers across the UK were affected by major disruptions to the mobile services for a number of hours on Monday evening.

Many subscribers of the networks took to social media to complain that they had been unable to make calls to landline phones.

O2 told its customers that BT—which provides fixed lines to the mobile operator—said that it was investigating a problem with its network.

EE also confirmed that its subscribers were having the same problems with making calls to landline telephone numbers.

The nationwide network strife additionally affected customers on GiffGaff and Tesco Mobile, both of which are MVNOs that use O2's network.

A spike in complaints were reported by mobile customers from late on Monday afternoon to around 8pm last night suggesting there were major problems with BT's network, according to Down Detector.

Ars has sought comment from BT, however it hadn't got back to us at time of publication. We'll update this story if we hear more from the former state monopoly.

Do you know what caused this service disruption? Get in touch with Ars, in confidence, via our tips@arstechnica.co.uk e-mail address.