1 Yes put another sim card in it from a different network and see if it works! Sim cards can be got for free these days, or borrow one.

2 If you have inclusive minutes or free txts, the calls and txts are free!

3 £10 unlocked sim card is just a sim card, it probably means for an unlocked phone!

To find out the actual costs for alls and txts, and various call plans, check online - go to the home page of the network you wanna check and look, its not that hard, for instance Vodafone uk is www.vodafone.co.uk, Three uk, is www.three.co.uk any guesses what O2 or T-Mobile could be? or do you really want us to do it all for you instead of just looking it up?