Imessage can't be tracked. Iphone is the BEST‏

http://news.cnet.com/8301-13578_3-57577887-38/apples-imessage-encryption-trips-up-feds-surveillance/ 

If you want your conversations to remain private you should buy an Iphone.  Otherwise your gansta activity could be monitored. 

Encryption used in Apple's iMessage chat service has stymied attempts by federal drug enforcement agents to eavesdrop on suspects' 

An internal Drug Enforcement Administration document seen by CNET discusses a February 2013 criminal investigation and warns that because of the use of encryption, "it is impossible tointercept iMessages between two Apple devices" even with a court order approved by a federal judge 

The DEA's warning, marked "law enforcement sensitive," is the most detailed example to date of the technological obstacles -- FBI director Robert Mueller has called it the "Going Dark" problem -- that police face when attempting to conduct court-authorized surveillance on non-traditional forms of communication. 

When Apple's iMessage was announced in mid-2011, Cupertino said it would use "secure end-to-end encryption." It quickly became the most popular encrypted chat program in history: Apple CEO Tim Cook said last fall that 300 billion messages have been sent so far, which are transmitted through the Internet rather than as more costly SMS messages carried by wireless providers. 

The real issue is why the phone companies in 2013 are still delivering an unencrypted audio and text service to users. It's disgraceful."