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Originally Posted by paulmac
Thanks for that info, but does not mean that much to me. What I would rather be able to do (and was hoping this would do) is have the BB actually display which carrier's tower it is actually using. When I had the Razr, there were seem edits you could do to change it so it would display the carrier name for the tower it was using instead of always saying Cingular. Not that any of it meant you were roaming just was interesting to see when you were in different areas whose tower you were actually using.
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Here's something what will help on GSM Blackberries. On your BB go to Options / [Advanced Options on some BB's] / Host Routing Table
There will be a list of entries with numbers. Look at see which one is active (in bold - you may have to scroll down). Embeded in the name of the Host Routing Table entry names is the MCC/MNC. This is a GSM code that tells you which carrier is associated with the HRT entry. So the MCC/MNC of the carrier you are currently using is embedded in the active HRT entry.
Cingular's MCC/MNC codes are : 310-410 [main one] 310-170 [Old Cingular one] 310-380 [ATTWS Network]. Here's a link to a pretty good list:
http://www.howardforums.com/showthread.php?t=657335
This takes a couple of steps, but you can figure out the carrier.