How to call macro from one SAS program in another SAS program?

How can I call macro from one SAS program in another SAS program?

This is my SAS code with calling macro, which gets a warning "WARNING: Apparent symbolic reference MYMACRO not resolved."  
I thought this is a correct way to call macro. Anyone see a problem with the way I am calling my macro?

DATA testnbrs;
  INFILE 'phonenum.dat' TRUNCOVER;
    INPUT numbs $ 1-10 rcode $ 14-16;
RUN;

PROC PRINT DATA = testnbrs NOOBS;
  WHERE numbs = "&mymacro";
   TITLE "Testing ALL Phone Numbers";
RUN;

Below is the macro SAS code that I am trying to run:

%macro mymacro(numbs,rcode);
  if verify(trim(&numbs),"0123456789") > 0 then
    do;
      &numbs =" ";
      &rcode="1";
    end;

  else if length(trim(&numbs)) ^=10           then
    do;
      &numbs =" ";
      &rcode="1";
    end;

  else if length(substr(&numbs,1,10)) =10  then
    do;
      if verify(trim(&numbs),"0123456789") = 0 then
        do;
          &rcode="0";
        end;

if substr(&numbs,1,1) in ("0","1")        then
        do;
          &numbs =" ";
          &rcode="1";
        end;

      else if substr(&numbs,4,1) in ("0","1")   then
        do;
          &numbs =" ";
          &rcode="1";
        end;

      else if substr(&numbs,2,1)="9"            then
        do;
          &numbs =" ";
          &rcode="1";
        end;

   isame = 1;
      do i = 5 to 10;
        if substr(&numbs,4,1) not = substr(&numbs,i,1) then 
           isame = 0;
      end;

      if isame = 1 then
        do;
          &numbs =" ";
          &rcode="1";
        end;
    end;
%mend mymacro;

Input file phonenum.dat has the following numbers (for testing purposes):
012345678h
0123456789
9876543210
0987654321
0112345678
8876543210