/** ******************************
 * India mobile phone number *
 *********************************/
/**
 * starts with 9, 8, 7, or 6
 * Mobile numbers (including pagers) on GSM, WCDMA, LTE and NR networks start with either 9, 8, 7 or 6
 * reference: https://en.wikipedia.org/wiki/Mobile_telephone_numbering_in_India
 */
export declare function is_in_mobile_phone_prefix(tel: string): boolean;
/**
 * with/without +91 prefix
 */
export declare function is_in_mobile_phone(tel: number | string): boolean;
/**
 * very forgiving
 *
 * @returns +91xxxxxxxxxx if valid (10 digits after country code)
 *          empty string if not valid
 */
export declare function to_full_in_mobile_phone(tel: string | number): string;
/**
 * @returns +91 xxxxx xxxxx if valid
 */
export declare function format_in_mobile_phone(tel: string | number): string;