[robg adds: This worked, though I'm not sure I understand any of the info presented!]
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Dial *3001#12345#* to bring up the iPhone's Field Test tool, which will give you information about towers and signal strength, EDGE network, and more.
[robg adds: This worked, though I'm not sure I understand any of the info presented!]
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[92,052 views]
Hint Options
Access the iPhone's Field Test mode
I dialed the number, all I get is a message "Error performing request, No Network Service" and a Dismiss button. I thought maybe I should turn off WiFi in case it was trying the wrong network, but that had no effect.
Access the iPhone's Field Test mode
Oops, it looked like I missed the final asterisk. I dialed the correct number, this time I got a voice message "your number cannot be completed as dialed.."
Access the iPhone's Field Test mode
I had both errors mentioned above and both turned out to be user-related (ie, typos).
Access the iPhone's Field Test mode
Oddly, if you dial this directly on the keypad, it seems to work and provide the data indicated. But, if you add this number to your contacts list and select it from there, it results in the "Your call cannot be completed as dialed" recording.
Access the iPhone's Field Test mode
Ah, that explains the problem, I entered the number into Contacts and dialed it from there. I was able to connect when dialing manually.
Access the iPhone's Field Test mode
That's the same code that's used on some Nokia phones...
Access the iPhone's Field Test mode
I always used it to put inappropriate things on my friends phones. :D
Access the iPhone's Field Test mode
Yeah, lots of information.. here's all I know...
Access the iPhone's Field Test mode
The only thing that is needed is the Mobile Country Code (MCC) and Mobile Network Code (MNC) info if you are using the iPhone with an unsupported carrier. With that info you can create your own carrier bundle that has all the info for your carrier.
Access the iPhone's Field Test mode
Both iphone 3Gs at my house are not working with field test mode. They both give an error message of: "Error performing request. Unknown Error" Seems odd that we would both be having the same problem. The reason I want to access this is because I am suspicious of the signal strength meter. When we downloaded the most recent update 8/09, both our meters showed stronger signal strength without any increase in connection quality or dropped or failed calls in my home. I think they changed how the signal strength meter works. Can anyone help me debug field test mode or at least explain what might be going on with the signal strength meter?
Access the iPhone's Field Test mode
On the 3GS, the signal strength "bars" area turns into an actual number when you enter Field Test mode. I believe this is the signal strength to the tower you are currently connected to. What is odd is that on T-Mobile, I can't see an Rx Quality value for the GSM Serving Tower, but this is probably either a product of the jailbreaking or the fact that TMobile's 3G network is inaccessible as it is on a different frequency from AT&T's.
Access the iPhone's Field Test mode
It looks like AT&T has disabled this USSD feature, not Apple. (Apple probably doesn't have access to this anyway, it's a network command). |
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