The easiest way to know this for sure is by actually calling them.
Download How To Tell If Someone Has Blocked You
Gif. Someone has blocked your number, but you still want to call them! When someone blocks your number, there are a few ways to tell — including unusual messages and how quickly your in this case, the person has used the number blocking feature on their phone.
How To Tell If Someone Has Blocked You On Snapchat Gotechtor from www.gotechtor.com
The closest receiving cell tower acknowledges your message and adds a mark to your account to keep track of how many sms you have sent for billing. Reckon you've been blocked on snapchat but want to find out for sure? But what it doesn't make clear is when others have seen quite enough of your snapchats and decided to block or delete you.
Do your calls go straight to voicemail?
If you have at&t, go to settings > phone > show my caller id and disable it. Before you proceed, think about why the person blocked your number. You'll probably know the answer to this already. The best way to check if someone has blocked your number is by calling then a numerous amount of times and checking if the call rings once then goes to voicemail.