You can get a bit more excitement from the letters if you assign each number to a range, albeit an irregular one.
So 1=A, 2=B, 3=C,D,E, 4=F,G, 5=H, 6=I,J, 7=K, 8=L, 9=M,N,O,P,Q, and 0=R,S,T,U,V,W,X,Y,Z.
So for example PUZZLING STACK EXCHANGE becomes 90008694 00137 30351943.
To decode, reverse the process. With some of the letters fixed, guessing the ...