Its probably because the 3G reception is coming from a different tower perhaps?
If you don't want this behavior (it preferring to lock to a low signal 3G rather than stronger 2G/EDGE) then dial in *#*#INFO#*#* on your keypad. Go to preferred Network Type and select GSM Auto (PRL). This will mean it will use 3G when available, but only when in a stronger signal area instead of trying to lock to a very weak one. Saves battery life too.
Thanks eXDee a great piece of info will try it,do i need to reboot? toggle ciphering need to be on? tryed it and still a very poor signal ,going back to GSM
From XDA-Developers: Had to hear it from the horses mouth, I called up HTC's tech support. I asked what was the difference between WCDMA preferred and GSM AUTO PRL. The gentleman I spoke to told me that they both have lots in common and that the only difference is that WCDMA preferred will favor 3G and GSM AUTO PRL will favor EDGE.
He continued to tell me that WCDMA preferred needs to reach a low threshold to go straight into 3g from edge. GSM AUTO PRL has a higher threshold, or higher standard has to be met (db of 3g signal) before it will go into 3G.
He mentioned that gsm auto prl will save the user a bit more power because it wont force the phone to continuasly hunt for a stronger signal. Typically this option gives our n1's a weaker signal and slower data speed. But he said it depends on our network in our city.
I also verified this information with t-mobiles tech support. They were a bit vague though. But they did mention that WCDA preferred will prefer 3g and that gsm auto prl is its complete opposite and will only prefer 3g if the signal is strong enough.
What do you guys think? Does this make sense?!?
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