Any reasons why i should unlock my phone? I have at&T. what are the pros and cons behind it

only reasons I can think of to unlock are if you are changing carriers, would like to use a SIM from a local carrier while overseas, or to make it easier to sell.

there's really no downside

cool thanks im leaving it alone then

Well there are many many benefits to unlocking your phone. I discuss 6 of most important in my eBook on benefits of unlocked phones, you can get it FREE at globalunlock.com - Official Mobile Phone Unlocking Site, you will see where to get it on the right side.

Any other questions, posts here or contact me.

The only downside is, AT&T will no longer "officially" support your phone, and any issues that arise, they *may* blame on your device being unlocked. The only real benefit is to use any SIM card you want in your device.