U can hack ur phone bt I dont recommend it.Wat I do is use a sis signing software to sign the application and then add it to my phone.Here is how u do it-
First go to- http://s60certkey.com/
U hav to sign up and enter ur phones serial number.They will then send u a zip file with the two certificate files to ur e-mail within 2days.
finally drag and drop the sis file u want 2 sign on to the programe.
-Click sign
-browse to ur certificate files files u get from s60certkey.com and just add.
Gd luck bro