+1-301-(3121000...3121999), Bethesda, Maryland

• For trunk calls: 0 301 3121000 (Trunk Code + National Destination Code + Subscriber Number)
• For international calls: 011 1 301 3121000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number)

3121000 ~ 3121999 (العدد: 1,000)

Example:

• +1-301-3121000 / 0111-301-3121000 (1301-3121000 / 1-301-3121000)
• +1-301-3121001 / 0111-301-3121001 (1301-3121001 / 1-301-3121001)
• +1-301-3121002 / 0111-301-3121002 (1301-3121002 / 1-301-3121002)
• +1-301-3121003 / 0111-301-3121003 (1301-3121003 / 1-301-3121003)
• +1-301-3121004 / 0111-301-3121004 (1301-3121004 / 1-301-3121004)
• ...
• +1-301-xxxxxxx / 0111-301-xxxxxxx (1301-xxxxxxx / 1-301-xxxxxxx)
• ...
• +1-301-3121995 / 0111-301-3121995 (1301-3121995 / 1-301-3121995)
• +1-301-3121996 / 0111-301-3121996 (1301-3121996 / 1-301-3121996)
• +1-301-3121997 / 0111-301-3121997 (1301-3121997 / 1-301-3121997)
• +1-301-3121998 / 0111-301-3121998 (1301-3121998 / 1-301-3121998)
• +1-301-3121999 / 0111-301-3121999 (1301-3121999 / 1-301-3121999)