[header] How to protect the data on your phone [title] Register your imei (international mobile equipment identity) number. [step] This is the number used by the police when trying to recover a stolen phone, without this number, the are virtually useless. Network providers also use the number to block a stolen phone, so that nobody else can use it. 
Your imei is usually found under the battery of you can get it on-screen by dialing * 06. Register you phone at www.immobilise, a site set up by the police.