It can be frustrating when you're trying to communicate with someone and can't get ahold of them. You might start to wonder if they've blocked your number. Here are a few ways to tell if someone has blocked your number. If you call a person and it immediately goes to voicemail or rings once (or a weird number of times) and then goes to voicemail, that's a sign that your call is being redirected to voicemail. This could mean that the person has blocked your number, but it could also mean that they're screening their calls or there's something wrong with their phone. If you get a message like "the person you are trying to reach is unavailable," that's another sign that your call is being blocked. You can also try calling from a different phone.