I'm travelling to Suriname, I have adaptor for round 2 prong Euro-like plugs. Electricity is 220-240 v. Do I need transformer step-down when charging my iPhone 4s (OS 5.0)
No. Apple supplied iPhone Wall Charger will take any input voltage from 100-240v. If it is 220-240v this is exactly in the range of the Apple charger.
No, all you'll need is the plug adaptor. The AC power supply is universal (if you look on the power supply, you'll see the voltage and frequency ranges it's good for).
At home I just have a plug that the usb port goes into so I can plug into the wall.
here at work, I do see some folks have a little adaptor with plug to use when charging the phones.
I will get one of those.
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