WhatsApp never announces a block, deliberately: blocking is a privacy feature, and notifying the blocked person would defeat it. What exists instead is a handful of indirect signs, none of which is proof on its own, and a folklore of "tricks" that mostly are not true.
This guide sets out each sign and its innocent explanations, the one test that comes close to certainty, how a block differs from a deleted account or a changed number, and what it means when it is customers doing the blocking.
The five signs, and their innocent explanations
Every sign has an innocent twin. One tick can be a phone that is off, abroad without roaming, or out of battery for days. Last seen, photo and status can all be restricted to contacts only, or nobody, by ordinary settings. A call can fail on a poor connection.
What makes a block likely is the whole set of signs together, persisting for days. Any one alone tells you very little.
- Messages stuck on one grey tick, indefinitely. One tick means delivered to WhatsApp’s servers; the second means delivered to the recipient’s phone. Messages to someone who blocked you never earn the second.
- Last seen and online status vanished. If you used to see them and no longer do, something changed: a block, or an ordinary privacy setting.
- Profile photo frozen. You keep seeing the old photo, or none, because updates stop reaching you.
- Calls that never connect: they ring your side but never theirs.
- No status updates or About changes visible any more.
The group test: as close to proof as it gets
The strongest available signal is trying to add the person to a new group:
- 1
Create a new group
Start a new group with any willing contact, or just yourself and the person in question.
- 2
Try adding them
Select their contact as a participant.
- 3
Read the error
If WhatsApp says it "couldn’t add" them and suggests inviting via link, that is the response you get from someone who has blocked you.
Even this is not absolute: the same error appears when someone’s privacy settings restrict who may add them to groups. Combined with one grey tick, no last seen and a frozen photo, though, the picture is as clear as WhatsApp allows.
What looks like a block but is not
- A deleted account: the chat stays in your list, the photo disappears, messages sit on one tick. The tell: a deleted account eventually shows no profile at all.
- A changed number: the old number goes quiet exactly like a block, and if it is recycled you may even see a stranger’s photo appear.
- Someone who simply stopped replying: muting changes nothing on your side; all the technical signals stay normal.
- A phone genuinely off: travel, a broken handset, a dead battery. Everything looks like a block until the phone comes back and two ticks land at once.
What you can sensibly do about it
No setting, trick or third-party app reveals a block with certainty. Apps promising to are guessing from the same public signs you can read yourself, while asking for your account access to do it.
Messaging from a different number technically works, because blocks apply to numbers, not people. Think hard before doing it: someone who blocked you made a choice, and routing round it is rarely welcome. Done repeatedly, it becomes harassment.
If the contact matters professionally, use a different channel once, politely: email, a phone call, or a mutual contact.
When customers block your business number
For a business, blocks are feedback, and they compound: every block raises the odds of reports, and repeated reports put a business number at risk of restriction. The remedies are unglamorous and familiar to anyone who has run a UK email list: message only people who opted in, answer quickly enough that customers do not feel spammed into silence, honour opt-outs immediately, and keep broadcast frequency modest.
Related: WhatsApp broadcasts that actually reach UK customers