Calling Eritrea from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 291 - Country Code for Eritrea
• Phone Number (may not begin with 0) - 7 digits including area code
• sample call from US to an Eritrean landline: 011 291 1 ??? ???

How to dial to Eritrea cellular:

• dialing format for calls to a cell phone: 011 291 X ??? ???
• X can be 1, 7 or 8 (the latter is used for fixed CDMA wireless lines)
• when X is 1 the second digit is 7 (1 7?? ???)

Area Codes:

• area code is 1 for landlines in all locations: Asmara, Assab, Massawa, etc