Perhaps a macro lens, advice needed on compatibility

Any advice on well priced phones that support WiFi calling? Ideally under £300. Also I own a Nexus 6p from CPW, is there any way to get WiFi calling working as it is on an EE contract but no…

Any suggestions for an ultrabook or laptop in a similar form factor for ideally £500 or £600. Don't want anything bigger than 13 inch as to be used for university, need a reasonably powerful…

I have a friend that can send over a nexus 6p from the us to save money, but would the phone be compatible on e.g. O2 UK network?

Are there any other deals around at the moment to buy the 6p except carphone warehouse? Looking to trade up from a OnePlus one

What price would people buy this for? Thinking of getting a nexus 6p, just wondering the going rate for a 64gb OnePlus one in very good condition?