I had some very ugly experiences setting up one for my cousin (I stupidly didn't lie and registered her as being from Uruguay and under 18), which made the phone behave like a brick ("sorry, no apps available in your country", "sorry, you have to be over 18 under laws from another country to use most of the features of this phone").
Changing the Live account did not work, I had to reset the phone and create another account for her, lying about her age and country so the phone could work properly (she wanted to use Skype and WhatsApp, not exactly the most demanding use case).
That stupidity turned me off Windows Phone for the foreseeable future (although the hardware is top-notch).