Telcel México
b) For 3G speeds and features to work -which is independent of GSM voice calls already working), you need to get the AT&T version of the phone, the one that has the 850 Frequencies, otherwise, at the moment of this writing it won't work since there are no other 3G frequencies available in Mexico (yet!) -
c) You need to configure your GN1 (AT&T 850 Mhz frequencies version, remember) to include the APN, you do this as follows:
Remember, this if for Mexico's TELCEL which is the one I use, nevertheless, for other operators the settings should be pretty similar, of course the values for the some APN fields will change.
Now, the good stuff: TELCEL's 3G configuration:
In your Nexus One, Get into: Settings -> Wireless and Networks settings -> Mobile Networks -> Access Point Names (APN)
Then Create one NEW access point and give it a name, I used: "Internet 3G"
Fill in the data as follows:
APN: internet.itelcel.com
Username: webgprs
Password: webgprs2002
APN type: default
Leave all the rest fields with their default values.
Continue on to configure MMS (multimedia messages) APN or, if you just want 3G connectivity for now Reboot / restart your phone and you should immediately be connected to the Telcel's 3G network.
Now, for MMS (multimedia messages) setup, do the following:
Again, in your Nexus One phone, get into: Settings -> Wireless and Network settings -> Access Point Names (APN)
Then Create one NEW access point and give it a name, I used: "Mensajes Multimedia"
Fill in the data as follows:
APN: mms.itelcel.com
Username: mmsgprs
Password: mmsgprs2003
Select the MMSC field and type the string (no quotes): "http://mms.itelcel.com/servlets/mms"
PROXY MMS: 148.233.151.240
MMS Port: 8080
MCC should already be as: 334
MNC should already be as: 020
APN type: mms
Leave all the rest fields with their default values, even if they are empty or null
.
Reboot your phone and you should immediately be connected to TELCEL's 3G network. You will see the "3G" icon on the top right side of your screen. You should also be able to send multimedia messages