Q: I am moving to London this summer. Do I need to wait to purchase an iPad there to use the 3G connection?
A: Technically, an iPad 3G purchased in any country will work fine in any other country that offers iPad 3G service, since the iPad is sold “unlocked” and can therefore be used with any SIM card.
That said, however, the power adapter included with the iPad will be specific to the country in which it is sold. This means that if you purchase an iPad in the U.S. you will receive a North American power adapter in the box. Although the actual power adapter itself is capable of working with the different voltages in various countries, the actual plug that connects to the wall will be different, and you would therefore need to change the plug module or use an international travel adapter.