Telephone numbers in Estonia follow a closed telephone numbering plan. The numbering plan of Estonia was reorganised from 1th May, 2003 into closed numbering plan. All calls inside Estonia are local; trunk codes are not used. Landline phone numbers have 7 digits, mobile numbers can have either 7 or 8 digits, machine-to-machine (M2M) numbers can be up to 12 digits. Telephone numbers are portable between locations and operators. Estonian SSR had +7 014 area code.