You need a UK phone number (+44). Use a service like Twilio or a dedicated SIM card. Register that number with WhatsApp Business.
Not everything with "FREE" is a trap. Many legitimate businesses use this exact model to drive customer engagement.
The allure of "free" services is always tempting, but it's crucial to approach such offers with caution. If "Bit.ly/44WhatsApp" seems too good to be true, it might be best to reconsider. Always prioritize your digital safety and explore official channels for any promotions or services related to WhatsApp.