What is the code for calling Burundi from DRCongo?

The telephone country code for Burundi is +257.

To dial an international call from the Democratic Republic of Congo, dial the number beginning with the plus symbol if you are calling on a mobile phone, or replace the plus symbol with 00 if you are calling from a landline phone.

(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.)
The telephone country code for Burundi is +257.

To dial an international call from the Democratic Republic of Congo, dial the number beginning with the plus symbol if you are calling on a mobile phone, or replace the plus symbol with 00 if you are calling from a landline phone.

(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.)