I am definitely NOT a tech.....Tried overclockedpc's fix to my flashing red 3G light.  So far, no connection.  Once I activated the MCell it worked great for about a month.  Then it started going "off-line" every couple of weeks.  Gradually it got to the point I powered off the MCell at least 3 times a week until last week.  After that the power offs haven't worked.  This is so frustrating.  If I'm lucky I have 1 bar inside my house.  When the MCell works I still don't have all bars, but at least I can receive calls and text. Wish there was a permanent fix.  If I switched phones to the newer Iphone 4 would it help?