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While we do not typically block these kind of messages, a specific type of blockage, that of inbound Premium SMS and MMS messages, can occasionally block these types of text messages. I recommend contacting our Customer Service to remove those blockages from your mobile phone line. Also make sure that you are able to receive regular text messages. If you cannot, it means your mobile line's activation is not complete and you will need to contact our Customer Service to resolve that issue as well.
I hope this helps!