I'm very new to the unlocking and jail breaking of these phones and I really don't want to mess up my phone.
I have an jail broken and unlocked 3G version 2.2 and a baseband of 02.28.00with yellowsn0w 0.9.8 installed .
I can use another sim card with this phone no problem.
What I was wondering how do I go about updating to 3.0 software without loosing the ability to use other sim cards.
Thank you in advance.