[Q] IMEI number. Safe to give it out?

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http://forum.xda-developers.com – This is a long-standing discussion amongst me and my friends that never seems to get anywhere! Is it safe in the UK, to give someone your IMEI number when you're trying to sell a phone. Personally, I always thought that it would be really useful because you could check to see if it's been stolen / lost etc but others say that it could be cloned and land you in a lot of trouble with huge network charges etc. Surely the sim card is the thing that you need to protect as you can use it in any phone with any IMEI.. Can someone offer any expert advice? (HowTos)