No 3G or Fluctuating between 3G & Edge

[G1andonly]

Here is what I did *#*#info#*#* from your dialer
Switch your wcdma preferred to wcdma only for about 24 hours ( that's what I did but you might be able to switch sooner).
Then switch back to wcdma preferred ( if possible switch back in a place where you have good 3g)
And now you should be strong on 3g, even indoors.
And just try not to completely cover the bottom half of the phone but you can hold it when talking and doing anything else.
I had the issue and it hasn't happened again.