Following 'extensive customer feedback and research'. Asda has extended its range of pay-as-you-go tariffs and is now offering deals up to £25.The supermarket is hoping to entice mobile users who don't want the bind of a contract or who have a phone already, with deals starting at £5 for 200 texts only and ending with that £25 deal, all of which are paid for upfront rather than continual direct debit.In addition, Asda has also launched the Asda Mobile Tariff Guarantee Service which will advise customers on the best Asda Mobile phone tariff to get the most value for their money. Basically, the store will look at your use and match a tariff to it.James McMurrough from Asda Mobile said: 'At Asda we listen to our customers’ needs and in return offer them the best value for money. We have made our phone tariffs as transparent as possible and what you see is what you get. For high usage users, the £25 phone tariff gives unlimited calls and texts with absolutely no hidden costs. To add to this, we’re proud to announce an industry first with the Asda Mobile Tariff Guarantee Service which will help ensure that each and every customer is on the best possible phone deal for them resulting in even greater value for all our customers.'