I have somewhat the same problem and appreciate the frustration of serious hardware changes.
What is "the SIM card trick"?
Currently I am trying a SECURITY WIPE ("hard reset" by most)
So far:
the latest device software for your Bold. Currently it is 6.0 Bundle 3084
*228 options 1 and 2 don't improve this.
battery removal or Left Alt + right Shift + Del make no improvement
(There is some confusion in "hard" versus "soft" reset.
My best understanding: battery removal ="soft" SECURITY WIPE="hard")
Battery replacement does not fix the situation.
Disabling the WiFi (serious consequence to use the phone) doesn't fix this.
Hard set to 1XEV network technology does not fix this.
Factory Store "technicians" knew no more than "new battery", "hard reset", "no diagnostic" and "sorry".
after the phone finishes charging I will *228-2 it and see what tomorrow brings...