Do any of you lot use these mobile sims when overseas? I've been looking at a few where they seem to offer free calls to my handset but wondered if anybody had any real world experiance of them? Are they a good deal? sim4travel say that their sim costs 39p a day to use but incomming calls are free. Calls made by me would be 25p a minute, getting a text would be free although sending a text would be a hefty 39p a go.