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The old Kindles had physical number buttons on the keyboard which got removed in the K3. The shortcut for typing in a number is to use the top row of letter keys and to hold down Alt.
Alt EQQ is equivalent to 311 which allows you to force it to try to roam to another network. This will only be useful in countries where multiple networks have a roaming agreement for AT&T or Vodafone.
Alt RQQ is equivalent to 411 which shows version numbers and some stats about the Amazon servers.
Alt YQQ is equivalent to 611 which shows the cell network information. It will be blank on a WiFi only Kindle.
Alt UQQ is equivalent to 711 which shows WiFi network information.
Some of these screens have multiple pages so use the page up/down buttons on the side to scroll. They're meant to be used for diagnostics so they're a bit unfinished looking.
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