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As for the frequency you are using, use the following guide to match your ARFCN (Absolute Radio Frequency Channel Number): "Network Operating Mode", if it is NOM 001 then Voice has higher priority (Class A), while NOM 002 indicates Data has a higher priority than Voice (Class B). Note that this Field Test Mode was disabled in i OS 4.0, and re-enabled in i OS 4.2.1.However, many of field test features listed are no longer available unless you use an earlier version of the firmware, or re-enable via homebrew.i OS 4 was the first major i OS release that reflected the name change.
tel://NUMBER will pop up a dialog asking if you wish to make a cellphone call to NUMBER using the baseband.
facetime://CONTACT will pop up a dialog asking if you wish to make a video call to CONTACT using Apple's Facetime over Wi-Fi.
Mode: Connected Line Presentation You will be shown whether Connected Line Presentation is enabled.
If a number you called is actually forwarded to another number, this feature allows you to see the actual number you got forwarded to.
Major new i OS releases are announced yearly during the Apple Worldwide Developers Conference (WWDC), and are usually released in September of the same year, usually coinciding with the release of new i Phone models.