THE founder of Phones 4u says mobile networks acted callously after his firm collapsed and put 5,600 jobs at risk.

John Caudwell said the decision by O2, Vodafone and EE to end their contracts within six months of each other appeared to be an attempt to kill off the retailer.

The entrepreneur set up the operation in the 1980s before selling it for £1.5bn in 2006.

He said: "What I find appalling is the way this has been done.

"The way the networks seem to have worked in collusion.

"I'd love to be able to prove that point because if there was obvious proof of collusion, that'd be extremely worrying."

The collapse of Phones 4u, which has 700 outlets including around 550 standalone stores, follows EE's decision to join Vodafone in cutting ties with the retailer, which sells contracts on behalf of the network operators.

Staff were told to turn up for work on Monday to attend briefings with management, but the stores remained closed.

Mr Caudwell said he had never seen "such a ruthless, hard-hearted attempt to kill a company".

He added: "This network decision is extremely callous, extremely ruthless, against a company that's given it millions of connections over the last 20-odd years of partnership.

"You don't treat a partner that you've been trading with all that time by just completely cutting off the supply instantly and then a few days later, the other supplier cuts it off.

"That just smells of collusion.

"You tell me where else that has ever happened in the last 50 years?

"I guarantee, without doubt, prices of handsets will go up very quickly after this.

Mr Caudwell said only the Government could now save Phones 4u, adding: "With no network supply, there's no business.

"I'm not sure anybody, including the management team, saw it being this brutal."

Vodafone rejected any suggestion it behaved inappropriately.

It said: "Phones 4u was offered repeated opportunities to propose competitive distribution terms to enable us to conclude a new agreement, but was unable to do so on terms which were commercially viable for Vodafone in the current UK market conditions.

"We were told by the Phones 4u management team that they had little commercial flexibility due to their debt repayment obligations, but that they had a number of alternative strategies in place if we couldn't reach an agreement with them."