Wi-Fi Connectivity Issues

I got my iPhone 6 two months ago, and I have been having troubles with the wi-fi at work. My old iPhone 5 worked perfectly with the wi-fi at work, so this makes no sense. With my new phone, I have been able to connect to the wi-fi, but it does not work. My co-workers have iphones and they can connect easily and use the wi-fi. My phone works perfectly with my wi-fi at home, school, etc. Any suggestions? I hate to keep draining my data.