Review on Opensignal by Kasey Storrs

It's very easy to use, gives you an overview of your current signal strength compared with others in same area or countrywide which helps when deciding where/how best place phone call etc. There are some bugs here & there but that could be because I'm not using it daily so maybe things get fixed after more usage? The only thing about this app is its price tag! You can't just buy one device if you want all these features (compared with sim card providers). Using while driving especially at night time.