3 Cordless Mic UHF System??

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The VocoPro UHF-5800 system is what I use for events that require more than two. I've been using it for three years and it has yet to let me down. This is sort of a unique thing for VocoPro... a product that actually works better than any product they've ever made.
 
Guys, I have a GTD dual wireless system that freaks out whenever an iPhone gets near them. Am I the only one who has experienced this? I stopped using them this past summer when they went crazy because the officiant muted but did not turn her iphone off.
 
Nope never had this problem but then again my phone is not an iphone. I have my phone always on an send and receive calls as I dj.