I've not come across many places with a flaky phone signal, but of course that's a consideration. As far as I know, there are two ways to use the network - either using the native phone app, or the web app. Any more?You also need a phone signal to use the app. Some chargers have a WIFI connection which can be used if the phone signal is flaky. I would definatly make sure you try out all the possible ways to use EH when you are not desperate to charge.