Consumer expert Martin Lewis says households should haggle with their utility providers to bag themselves a cheaper deal ahead of contract price hikes at the end of March.
Firms tend to raise their prices every year on 1 April in line with inflation, dubbed the annual utility price surge.
This means millions could see their monthly outgoings increase – including on broadband, phone and energy bills, reports the Mirror Online.
But Lewis, the founder of MoneySavingExpert.com, says customers who don't haggle are "almost ripping [themselves] off".
He told BBC Radio 5 Live: "Price hikes are coming at the end of this month.
"Vodafone, EE, Three, BT, Sky, TalkTalk Virgin, EE and O2 are all raising prices. If you've got one of those contracts it's time to start haggling.
"Yes, many customers will not be able to switch because they're locked into a contract - and the price rise is written in the small print - but millions who are rolling deals can take advantage and save some money,
"If you've received a letter from your provider on a rise that's not in the small print, you have 30-days from the day you receive the letter to cancel your contract - again, this is your opportunity to score a lower deal.
"I’m talking all about call centre haggling – the powerhouse of haggling in the UK."
Martin advises people to speak with their provider's customer retentions team, which budget to allow some leeway on contract prices.
He added: "If you're after a cheaper TV deal, for instance, consider what channels you could easily drop.
"Once you know what you want, enter your details into a few comparison websites to get a benchmark of what is available elsewhere.
"Once you've found a deal you can afford, call up your provider and explain that you'd like to stay, but have found a cheaper deal elsewhere.
"Explain that you're going to have to leave and hopefully then they will give you a decent deal to stay."
On the topic of mobile phone contracts, he said: "There are only four mobile network providers in the UK - all other firms are simply piggybacking off them.
"So if you find a good deal that your network won't match, find out what other firms are using their signal and see if you can negotiate a saving through one of them instead."
