Voice Pay Monthly SIMs are for use in your phone only.

SIM Only plans
Available in 3Stores, or via 3's telesales, to new approved customers registering on a SIM Only SIM Zero, SIM 10, SIM 15 plans or The One Plan . Inclusive allowance for SIM plans are for calls from the UK to standard UK landlines beginning 01, 02, 03 and UK mobiles or texts sent from the UK to other standard UK mobiles. Personal Numbers (070) and numbers beginning 08 are excluded from bundle. For pricing information go to   Three Price Checkeror   Three Price Guide. 3-to-3 calls must be within the UK (Fair Use policy of 2,000 minutes applies). Access to Skype is subject to downloading from 3, and mobile compatibility. Free calls on Skype are Skype-to-Skype calls from the UK. SIM is only to be used in 3G mobiles. SIM will be disconnected if used in a 2G mobile and you’ll still be charged for the contract. One month’s notice is required to terminate the contract. Your mobile may need to be unlocked by another network before you can use your 3 SIM. Unlocking fees may be charged.  Service limitations and terms apply. Pop into a 3Store or visit three.co.uk.