How to unblock Kik at school?

Okay so my school has blocked everything, and it is extremely irritating. Funny thing is that this year they announced that we would be allowed to use our phones at certain times that our teachers allowed (Also for educational purposes) yet they blocked everything so we can't even use our devices LOL what the heck. But it is also strange because none of my Samsung devices can load Kik, but Kik works on my old Iphone? I would like to know how to get it to work on my other devices though because I don't always bring my Iphone to school, I forget to or it's dead and needs to charge. To sum things up, I want Kik to work on all my tablets, not just one that's probably only running by luck itself, and doesn't get blocked for some odd reason. Can anyone help? Thank you for your assistance.

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