Repeaters Killing Signal?


    I have great signal everywhere around my office building, except when I am inside.  I swear the verizon? repeaters I believe they use in my building kill the TMobile signal.  I can even get 4G coverage in the basement of our office building, but not on the floor I work.  Could this be an issue with the repeaters in the building?  How can I convince my telecom guy to do something about it other than suggest to me that Verizon coverage is better?  Which he has already done.  I love Tmobile and want to stay a customer, but not having good coverage at work is killing me.

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