How can I have Beamer number slides in a frame title?

More or less what it says on the tin: I want something like:

\frame{\somecounterforpagenumbers : My Title}


I assume there is a built in counter that I can reference here, but I'm not sure what it is.

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The counter you are looking for is framenumber –  Corentin Oct 24 '12 at 7:29

You are looking for the command \insertframenumber, the corresponding counter is called framenumber:

\documentclass{beamer}

\begin{document}
% manually increase the frame number