Lithuania uses an open telephone numbering plan with all phone numbers having nine digits, including the prefix "0", a 1–3 digit area code, and a 5–7 digit subscriber telephone number.

Lithuania uses a total of 47 area codes for landline phones, all beginning with 3, 4 or 5. Within same area code, landlines can be dialed without the prefix and the area code.^[2]

Area codes for mobile numbers begin with 6, corporate or state institution numbers with 7, toll-free, reverse-charge and shared-cost numbers with 8, and premium-rate numbers with 9.^[2]

Network services numbers begin with "1", dialed without a prefix. This includes numbers beginning with "11", reserved for emergency and special services, such as:

• 112 – National emergency number
• 113 – Non-emergency medical number
• 116 xxx – Harmonised services of social value
• 117 – Telecommunication helpline
• 118 – Directory assistance
• 119 – Fault registration

Since 1 March 2024, Lithuania uses "0" as a trunk prefix.^[3]

The international dialling prefix is "00". Lithuania uses +370 country calling code.

During the Soviet occupation and for a period after it, the country used the Soviet numbering: +7 012 area code was used until 1993;^[4] the legacy numbering was used for the national area codes until it was replaced in 2001–2003;^[5] the domestic prefix "8" was replaced with "0" in 2024 (and fully deactivated in 2025^[1]), despite being planned since 2001.^[3][6] The delay was due to legacy emergency numbers 01, 02 and 03, which were kept active until 1 April 2022.^[7]