Hello, I bought my iPhone a while back (week 44 serial number). It was version 1.1.1 out of the box. I unlocked using a company called Aussie iPhone Unlock and then upgraded to 1.1.2 using the instructions here: http://www.aussieiphoneunlock.com/unlock_112.php Since then this company stopped operations so far as I can tell. I would like to know if it is safe to upgrade it to more recent versions, and either case, if an update is necessary to install newer iPhone applications. Thanks.