Three has unveiled a £15 per month pay-as-you-go tariff with an unlimited data allowance that is likely to prove popular with heavy data users at SMEs.
The all-in-one 15 tariff provides 30-day access to as much data as the customer wants, together with 300 any-network minutes and 3,000 texts.
Customers looking for more minutes can pick the £25 per month tariff, which offers 500 minutes, 3,000 texts and unlimited data.
The tariff has been introduced after research by Three indicated that people do not always know how much data they use, and therefore use minimal amounts to avoid being charged extra.
A Three spokesman confirmed that customers will not be subject to any type of fair use policy.
"Like the One Plan, users will be allowed unrestricted access to data. Users simply have to top up every month to get their allowance, but there is no notice period if they want to stop," he told V3.co.uk.
"The all-you-can-eat allowance applies to browsing in the UK, but does not include tethering or usage abroad."
Three also confirmed that iPhone 4 users will also be able to take advantage of the pay-as-you-go plan. Users are able to request a micro-SIM, which will be delivered free of charge, the spokesman added.
Three continues to live up to its reputation for aggressive strategies, having triggered a mini price war last year by offering micro-SIMs for use with the iPhone 4 despite not selling the Apple handset initially.
The operator was the first to offer a 30-day rolling contract for £15 per month with 300 any network minutes, 3,000 texts, 1GB of data and 2,000 Three-to-Three minutes.
Three also offered iPad users larger data allowances than its rivals for the same price at the end of last year.
This latest all-you-can-eat allowance looks to be good value, as other networks still cap data use.
O2 is offering unlimited texts, 500MB of UK data and 100 minutes for £15 per month, while Vodafone offers 500 texts and 500MB of data.
T-Mobile offers up to six months free internet on selected devices, but is still recovering from a severe backlash after plans to introduce a 500MB data cap for all existing customers.
Such was the uproar that the operator was quickly forced into a U-turn after Ofcom threatened to investigate the change in policy.
Latest Tesla news: Tesla stock price tanks amid reports of 'widening probe' by SEC and claims the base Model 3 loses money
SEC 'probe' takes its toll on Tesla as new research suggests that Tesla loses $6,000 on every $35,000 Model 3
10nm Cannon Lake Core i3-8121U CPUs make a rare outing with Intel's NUC mini PC
'Notorious' Australian child hacker thought he had executed 'flawless' hack
The former employee says that Tesla fired him for bringing the accusations to management internally