There's no chance to find out if someone has blocked one on SnapChat. Sending a text simply works as usual - the application tells one that everything has been sent just fine, but the message won't be received.
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Yes... when you send a text message - if the other phone accepts the message - it sends a 'ping' back to you - to let you know it reached its destination. If someone has blocked your number, the 'ping' cannot happen - and the network will state 'message failed'.
Go on ACCOUNT...... then PRIVACY SETTINGS..... then click on BLOCK LIST and the list of people you blocked will appear then you can choose to UNBLOCK any of the people you have already blocked
if you try to call the person then it will tell you that that general person has blocked your number