"any local call to any network only 38sen/min"
this is the problem. how to know local call or not ? TM number is easy. How about hotlink 017-8x, 010 xox/digi, 014 prefix ?
nowdays not all 013/019/014-5/014-8 is celcom.
Newest Celcom X-pax Plan, come and gives your view :)