Therefore , to call a land line number in Phnom Penh from other countries , dialing begins with + 855 23 followed by 6 or 7 digits .
Calls made from outside Cambodia must omit the prefix 0 .
To call a land line number in Phnom Penh from other countries , dialing begins with + 855 23 followed by 6 or 7 digits .
Calls made from outside Cambodia must omit the prefix 0 .