If you have just finished up an existing contract on your phone you may be looking around to see if there are any 30 day Sims that you can take advantage of. If you have an unlocked phone you will be able to do this. If you do not have an unlocked mobile phone you will need to purchase one or have your existing phone unlocked by a company that offers this technology to their customers.
You may think that 30 day Sim only deals are best because they do not tie you down to a long term contract, however, you will find that you get fewer minutes of calling time with a 30 day SIM plan.
For example, some of the best sim only deals with T Mobile you end up getting 1200 minutes of calling time on a 12 month plan that has a rate of £25 per month.
It is important to find the plan that has the features that suit you best. As all of the mobile networks have 30 day deals this is not hard. One network which may interest you is the Orange network. They offer 30 day SIM deals that have extras which are specifically tailored to different needs. One example is the Racoon series of calling plans. There are several 30 day SIM plans available in this line which includes a number of anytime minutes, a set number of text messages and unlimited landline calling.
If you want the freedom of a 30 day sim with the calling advantage of a contract which is 12 months in length consider T Mobile sim only deals. They offer their customers a flexible booster that can be changed each month. This booster gives you perks such as "free unlimited internet" or free calling to international telephone numbers or landlines.