/** ******************************
 * Italy mobile phone number *
 *********************************/
/**
 * Mobile numbers start with 3xx (300-399)
 * Format: 0AA BBB BBBB (variable length with leading 0 in local format)
 * Reference: https://en.wikipedia.org/wiki/Telephone_numbers_in_Italy
 */
export declare function is_it_mobile_phone_prefix(tel: string): boolean;
/**
 * with/without +39 prefix
 */
export declare function is_it_mobile_phone(tel: number | string): boolean;
/**
 * very forgiving
 *
 * @returns +39xxxxxxxxx if valid (variable length after country code, NO leading 0 in internal format)
 *          empty string if not valid
 *
 * Format notes:
 * - Local format: 0312 3456789 (variable length WITH leading 0) - used in Italy
 * - Internal format: +39 312 3456789 (variable length after +39, NO leading 0)
 * - Display format: +39 312 3456789 (formatted by format_it_mobile_phone)
 */
export declare function to_full_it_mobile_phone(tel: string | number): string;
/**
 * @returns +39 3xx xxx xxxx if valid
 */
export declare function format_it_mobile_phone(tel: string | number): string;