Return input value with prefixed +(plus) mark

[nipunadk]

How can we get the + mark prefixed with typed input ex: if user enters +46123456 can it returns the same ? now it returns 46123456 instead. Thank you.

<ReactPhoneInput id={id} name={name} value={value} onChange={onChange} maxLength={maxLength} disableDropdown={disabled} regions={constants.TELEPHONE_NUMBER_REGION} country={constants.TELEPHONE_NUMBER_DEFULT_COUNTRY} required={isRequired} />