Hi, A friend just got a iPhone 4 today and wanted to jailbreak it so that she can use MyWi for internet access. I'm confused about all these baseband upgrade/downgrade issues. Do I need to worry about the baseband with untethered/tethered 4.2.1 jailbreak ? She doesn't need an unlock but I am worried that the baseband can be affected and Apple might notice it if she goes in for a warranty repair. She just wants to jailbrake. What does she need to be aware of in terms of baseband issues? Thanks.