For the last week or so, Vodafone has been playing second fiddle to Three in terms of the best SIM only deals on the UK market.

Both were priced at £20 per month for enormous amounts of data, texts and calls, but Three held on to its status as top SIMO dog thanks to its all-you-can-eat data gambit.But Three's extraordinary offer has now finally ended, leaving Vodafone as the heir apparent to the crown.

The SIMO king is dead - long live the SIMO king!So what does Vodafone's biggest ever data SIM only deal look like Well, it's offering a massive 100GB of data each month for those same £20 per month bills.

Of course unlimited would have been nicer, but 100GB is still a sum that you'll struggle to even get close to using away from Wi-Fi in a single month - it amounts to around 100 hours of Netflix or Spotify streaming, so a good three hours of solid entertainment every single day.This impressive Vodafone SIM only deal in full:Vodafone's 'biggest ever data deal'  | 12 months | 100GB data | Unlimited calls and texts | £20 per monthJust £20 a month is a brilliant price for such a large amount of data.

It will give you loads of freedom to use your phone away from the Wi-Fi in comfort, without having to check the settings to see how much you've used every five minutes.

So if Vodafone is what you're looking for, this is the SIMO deal to go for right now.View DealWhy go for a Vodafone SIM only dealThere's a lot to love when it comes to SIMO deals with Vodafone.

Whether it's the allowance of all of your data and calls while roaming in 48 different countries, flexible upgrade plans, a great return policy or its impressive countrywide coverage.Not to mention the fact you will have access to Vodafone's VeryMe rewards scheme giving you discounts and freebies throughout your contract.What if I want a shorter term SIM only dealNot too keen on committing to a full year of Vodafone No problem.If you want some flexibility with your SIMO then Smarty, a relatively new player to the game, has a 30-day flexible unlimited data plan for just £25 a month, which also gets you your second month free if you sign up now.Still not convinced Select from our list of best SIM only deals in the UK today