What is the country code and area code of New Brunswick Canada?

Fredericton, New Brunswick, and the entire province of New Brunswick, use telephone area code +1 506.

Although calls from the USA to Canada or vice-versa are dialed "one plus," the same as domestic calls, international call charges will apply.

(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 Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)