/** ******************************
 * Thailand mobile phone number *
 *********************************/
/**
 * starts with 06, 08, or 09 (two-digit prefix)
 * Mobile prefixes: 06x (060-068), 08x (080-089), 09x (090-099)
 * reference: https://en.wikipedia.org/wiki/Telephone_numbers_in_Thailand
 */
export declare function is_th_mobile_phone_prefix(tel: string): boolean;
/**
 * with/without +66 prefix
 */
export declare function is_th_mobile_phone(tel: number | string): boolean;
/**
 * very forgiving
 *
 * @returns +66xxxxxxxxx if valid (9 digits after country code)
 *          empty string if not valid
 */
export declare function to_full_th_mobile_phone(tel: string | number): string;
/**
 * @returns +66 AA BBB BBBB if valid
 */
export declare function format_th_mobile_phone(tel: string | number): string;