If you're dead set against signing on the dotted line for 12 months, but want all the minutes, texts and data you can sink your teeth into, then you'll need to fork out a huge £56 per month. This provides you with unlimited calls and texts, but a miserly 1GB of data.
On the 12 month deal side of things, bolt on an extra 1GB of data to the On & On tariff (totalling 2GB per month) and it will set you back £25 per month, and include unlimited minutes and texts.
- Check out all the O2 SIM-Only deals
Best for… animal instincts
Orange likes to mix things up a little, so it's had the bright idea to name its deals after a variety of animals – isn't that just swell?
There's a range of one month and 12 month contracts on offer, each boasting delightful names such as Dolphin, Panther and Racoon.
If you're of the iPhone persuasion then Orange have a special range of tariffs just for you, but there's no animal names on offer... so there.
For the BlackBerry users among you, some of those lovely animal tariffs also have an option for you guys, at no extra cost (mostly).
Kicking us off is the Orange Dolphin 7 tariff (12-month contract) which will, yep you've guessed it, set you back just £7 per month, giving you 150 minutes, 500 texts and 250MB of data.
If you're on minimum wage that's just over one hour's work, or if you're a student that's about two pints (give or take your northern/southerly location).
If you'd prefer a rolling 30-day contract, then take a peek at the Dolphin £10.50 deal, giving you 50 minutes, unlimited texts and 100MB of data each month.
And for those of you who don't want/need data, then take a gander at the Canary deals – with the cheapest 30-day tariff available at £10.50 per month for 100 minutes and unlimited texts.
The cheapest iPhone deal rocks up at £10.50 per month for a 12 month contract, giving you 100 minutes, unlimited texts and 250MB of data.
Middle of the road
As far as the rolling 30-day deal is concerned, you'll want to look at the Panther £20.50 (or iPhone £20.50) – which offers up 300 minutes, unlimited texts and 500MB of data each month.
If you're after slightly better value, check out the 12 month options on the above deals, which will set you back £15.50 per month and give you 600 minutes on top of the texts and 500MB data allowance.
For those of you rolling in money and willing to splurge on your tariff, you can pay Orange £36 per month on a rolling one month contract for 1,200 minutes, unlimited texts and 1GB of data. This is available on the Panther and iPhone tariffs.
The monthly outlay is reduced to £31 if you opt for the 12-month contract – although better deals are to be had elsewhere, so if you're high volume user, make sure you shop around.
- Check out all the Orange SIM-Only deals
Best for… "The Full Monty" experience
Away from silly names and back to SIM-only reality, T-Mobile - sister network of Orange under the "Everything Everywhere" banner - offers a slightly reduced and easier-to-digest range of tariffs than its partner.
The T-Mobile site gives you a clear option between SIM and microSIM – although all the deals stay the same, and if you want the extra BlackBerry services (BBM, email and so on), you just need to make sure you include internet in your bundle.
T-Mobile's cheapest SIM-only deal will set you back £10.50 on a 12-month contract, and for that you'll get 300 minutes, 5,000 texts and 250MB of data, plus 500 additional minutes to call other people on T-Mobile.
The lowest 30-day rolling contract clocks in at £12.50 and gives you an average of 100 minutes (plus 250 T-Mobile minutes), 5,000 texts and 250MB of data.
If you don't want data in your deal then the 12 month option starts from £8 per month and the 30-day option is £10.50.