Two Table Data comparision

Table I
==========
SL_NO      Phases
=========   ========
 6066      Phase I
6014      Phase II
6013      Phase III
6017      Phase IV
6016      Phase V



Table II
==========
SL_No      CALL_IN_NUMBER
=====          ================
1      606628347702
2      60177278738
3      601374244
4      60142444
5      60166621344
6      6066923847874



I am expecting that do a look up of Table II in Table in case pattern matches ex 1 row in table II matches with 1st row of table one hence Column C in table two to be filled with Phase I.
similarly 4th Row in Table II matches with row II in table I.


SL_No      CALL_IN_NUMBER      Col C
1      606628347702      Phase I
2      60177278738      Phase IV
3      601374244                            Phase III
4      60142444                            Phase II
5      60166621344      Phase V
6      6066923847874      Phase I