Wi-Fi issues

this is the third HD2500 that I have owned and each vehicle has had very poor wi-fi service, to the point to where I would need to turn off my wifi on my phone just to get data. We are consistently in areas where AT&T has weak signals. So, I can only assume this is the culprit. When will we have the option to choose the cellular provider that works best in out area? 

Has anyone else experienced similar issues?