I'd take that bet. Smartphone chargers are 5 volts, 1 amp (excluding the new quick chargers, and tablet chargers). That's 5 watts. 5 watts is very little power, easily provided by that solar panel there. This can probably charge several phones at once on solar alone. It is probably connected to the grid, but only for when it's night.
So you'd take the bet and conceed to the likelyhood of it being on the grid? In the photo, It must be morning or late in the day to cast the long shadows. If the panel is adjusted to catch the most radiation it would suggest a very low sun even at mid day so it must be winter. Winter days are much shorter and is the available sunlight to charge. It also appears that there are multi story buildings around that would further cut into the available radiation. Now concider who would use the post and for how long. Nobody is going to plug a phone in and walk away while it charges for an hour. So the likelyhood of anyone using that station for anything other than a novelty is very low, and the likelyhood that their phone would be charges with solar power is even less. The reason they built that charging station is pure marketing. It portrays a good image of whomevers name is on the side of it.
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