The country dialling code for Tunisia is +216or 00216 (they're both identical).
If you want to make a call to Tunisia from abroad, you have to dial the following country code +216 (or 00216) followed by the national telephone number.
National telephone number: 20 123 456 (for local calls)
International telephone number: +216 20 123 456 (for calling from abroad to Tunisia)
Capital : Tunis
Population : 10 982 754 Inhabitants
Time : 2019-02-19 19:02
Time zone : Africa/Tunis