Which country has the dialing code00157?

Telephone country codes never begin with zero.

Country code +1, dialed as 00 1 from many places, is North America (USA, Canada, etc.); 57 is the first two digits of a three-digit area code. You need the next digit to narrow down the location.

Country code +57, dialed as 001 57 from many places, is Colombia, in South America.

To avoid confusion, it is best to write an international telephone number in correct international format, beginning with the plus symbol and the correct telephone country code (e.g., +1 or +57), omitting any dialing prefix.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)