Somewhere in most small businesses there's a WhatsApp group called something like "The Lads" or "Jobs Today," and it is, functionally, the operating system of the entire company. Job details, customer complaints, timesheets, the occasional argument about whose round it is - all of it, scrolling away into an unsearchable void.
What makes it risky, not just untidy
WhatsApp is genuinely excellent at what it's for: quick, informal messaging. It is genuinely bad at being a business record. Messages get deleted, people leave the group and take the history with them, and there's no structured way to find "what did the customer actually say they wanted" three weeks later when there's a dispute about it.
The awkward bit: personal devices, business data
Customer names, addresses, and sometimes photos of their homes or vehicles end up stored on personal phones with no company control over them. If someone leaves the business - amicably or otherwise - that data typically leaves with them. ACAS has plenty of guidance on the wider employment risks of blurring personal and work communication, and data protection is very much part of that picture.
You don't have to ban it, just stop relying on it
Nobody's suggesting you rip WhatsApp out of your business overnight - it's genuinely useful for quick coordination. The fix is narrower: anything that needs to be a proper record - job details, customer instructions, complaints - needs a home that isn't a group chat. That can be as simple as a shared form, or as thorough as a proper job management system that photos and notes actually feed into. We've written more on what that middle ground looks like over on our blog.
The verdict
Keep the group for banter and "running 10 mins late." Everything that matters deserves a system that doesn't disappear when someone changes their phone.