If you provide more information, perhaps someone can assist.Well I decided to try the most recent jailbreak with my iphone 4. Like I originally said, I really only wanted mywi and maybe sbsetttings. I jailbroke my phone and I couldn't make any calls. I have an ATT iphone on a newer baseband. So that lasted only 5 minutes.
There are lots of people running MyWi and SBSettings (and more) and they are not having any problems making phone calls.
What version of iOS?
What baseband?
What version of MyWi?
Could you make calls before installing MyWi and SBSettings?