I bought this Iphone 6 Plus about 6 months ago, I have never been in 4G network and have to constantly go to settings to reconnect to wifi no matter where I am. everyone else in the house has no problem with 4G or wifi, only my device. Live in 60543 zip code and at home there is wifi, and zip 60601 is work, which is also wifi, we switched from AT&T to Verizon, and I have had nothing but problems since switching.