Unless I am mistkaken, OpenCellID is only going to tell you the estimated location of the base station and the underlying technology (GSM,UMTS,LTE, etc)
The range field tells you the approximate area within which the cell could be, in metres. This is effectively an estimate of how accurate the location is.
If you want to know the signal range, you would have to use a platform like https://cloudrf.com to calculate a propagation map but you would need tower height, frequency, radio power, antenna design in addition to lat/long to do it properly. It it possible you can make some general inferences about these that would allow you estimate some of those but you would need to know more about the operators in question.