Question [Q] SIM unlock stock ROM the best way?

Hi,

I have a GS2 with a stock ROM and would like to know the best and easy way to unlock the phone.

Will I need to root the device? I would like to get around this if possible.

Thanks
Galaxy S2 i9100 | Stock ROM I9100XXMS2 | Build Number JZO54K.I9100XWLSW | Android 4.1.2