Many carriers already MITM port 80&#x2F;tcp (blindly sending SYN ACKs).  Symptom: try connecting to a random domain without a webserver (like <a href="http:&#x2F;&#x2F;cse.ucdavis.edu&#x2F;" rel="nofollow">http:&#x2F;&#x2F;cse.ucdavis.edu&#x2F;</a> ) and it will seem to have a website but just hang.