Here's several coaches confirming it: http://profootballtalk.nbcsports.com/2015/09/12/coaches-say-...
Also, the teams communication devices are provided by the NFL, and have nothing to with the individual teams: http://bleacherreport.com/articles/2564764-nfl-issues-statem...
Lastly, I'm not sure the tablet failing for Bill Belichick, but not the opponent, supports your claim that Belichick is trying to gain an unfair advantage out of this.
[0]http://www.si.com/nfl/2016/10/04/tom-brady-deflategate-ideal...
[1]http://www.wbur.org/onlyagame/2016/03/12/deflate-gate-scienc...
[2]https://www.sciencenews.org/blog/culture-beaker/deflategate-...
[3]https://www.youtube.com/watch?v=wwxXsEltyas
[4]http://www.breitbart.com/sports/2016/05/27/scientists-file-a...
On the other hand, this is Bill Belichick doing the talking, so I take the bulk of his complaints about the communications equipment with a healthy dose of skepticism. If you're not familiar with Mr. Belichick, he's earned the reputation of being worthy of suspicion when it comes to either exploiting a loophole in the rules or potentially breaking them outright and trying to explain them away[1]. A quick search[2] dredges up numerous cases of NFL teams visiting Gillette Stadium and experiencing significant communications system difficulties.
So, the cynic in me would like to pose a tentative solution to Bill: If his team would shut off whatever jammers and bullshit disruption devices they're using on the visiting opponents, maybe his equipment wouldn't fuck up as much either.
[1] https://en.wikipedia.org/wiki/2007_New_England_Patriots_vide...
[2] https://www.google.com/search?q=radio+trouble+gillette+stadi...