LONDON (Reuters) -Britain’s biggest mobile network providers including Vodafone and BT’s EE are facing a multi-billion-pound lawsuit for allegedly overcharging customers, after a London tribunal ruled on Friday that part of it could continue.

The case – which is also brought against Telefonica’s O2 and Hutchison’s Three UK, whose $19 billion merger with Vodafone was approved last year – was valued at over 3.2 billion pounds ($4.29 billion).

The Competition Appeal Tribunal (CAT) in a ruling on Friday threw out those parts of the case claiming losses from before October 2015 as having been brought too late.

But the CAT certified claims for losses from after October 2015 could proceed to trial.

Lawyers representing British consumer champion Justin Gutmann alleged the networks charged mill

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