I have an Apple iPad 3G on order in the USA that I am planning to send to a friend in the UK. I assume that 3G service carriers in the UK and in other countries have little information, since the iPad is not yet for sale outside of the USA. However, does anyone anticipate any issues when using the 3G service in other countries when the iPad was purchased in USA? Are carrier frequencies different in countries other than the USA, or are the iPads manufactured to be compatible with carrier frequencies in other countries? Thank you in advance for your response.