phoneLinks(phone: string,prefix: string,): PhoneLinks | null
Build tel: and wa.me hrefs for a phone number, or null when the number
has no digits. The prefix is the country dialling code (e.g. "44"); a
leading "+" is tolerated so a settings value of either "44" or "+44" works.
WhatsApp's wa.me wants the international number with no leading "+".
PhoneLinks | null