  We present a rewiew and also new possible applications of $p$-adic numbers to
pre-spacetime physics. It is shown that instead of the extension $R^n\to
Q_p^n$, which is usually implied in $p$-adic quantum field theory, it is
possible to build a model based on the $R^n\to Q_p$, where p=n+2 extension and
get rid of loop divergences. It is also shown that the concept of mass
naturally arises in $p$-adic models as inverse transition probability with a
dimensional constant of proportionality.
