anti radio-cell phone jammer?

I am a high school student, and texting via cell phone has become an increased problem to the faculty, and they may be installing a radio jammer which would render all cell phones within the building useless. Is there any device that I could purchase to prevent my signal being blocked, or a way that I could use my phone anyway?

thank you very much,and plaease understand I ask not to allow myself to text in class, but for emergency purposes only.

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