My partner recently purchased a Nokia Lumia 1020 and gave me his Nokia Lumia 800. I transferred my contacts from my sim card and they all ended up on his phone! I now realise that I have to reset my phone thus deleting his Windows Live account (primary account) and set up my own. He is using the primary account on his 1020. When I reset my 800 will it affect his contacts etc on his 1020? Hope I'm making sense!