/** ******************************
 * Switzerland mobile phone number *
 *********************************/
/**
 * Mobile numbers start with 07x (074, 075, 076, 077, 078, 079)
 * Format: 0AA BBB BB BB (10 digits with leading 0 in local format)
 * Reference: https://en.wikipedia.org/wiki/Telephone_numbers_in_Switzerland
 */
export declare function is_ch_mobile_phone_prefix(tel: string): boolean;
/**
 * with/without +41 prefix
 */
export declare function is_ch_mobile_phone(tel: number | string): boolean;
/**
 * very forgiving
 *
 * @returns +41xxxxxxxxx if valid (9 digits after country code, NO leading 0 in internal format)
 *          empty string if not valid
 *
 * Format notes:
 * - Local format: 079 123 45 67 (10 digits WITH leading 0) - used in Switzerland
 * - Internal format: +41 79 123 45 67 (9 digits after +41, NO leading 0) - always 9 digits
 * - Display format: +41 79 123 45 67 (formatted by format_ch_mobile_phone)
 */
export declare function to_full_ch_mobile_phone(tel: string | number): string;
/**
 * @returns +41 7x xxx xx xx if valid
 */
export declare function format_ch_mobile_phone(tel: string | number): string;