Using this free app you can find coverage in your place for all kind of network 2g , 3g , 4g it support all kind of providers , which give access to users to locate best coverage nearby , app also provide a list and colored real time map 
OpenSignal also helps to locate nearby hostspots it also can measure signal strength, This is some thing really cool feature i have found on play store , this is a must have app in your android device  

                                                  

                                        

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