You haven't said what your budget is, or if you require a contract or not.
But if its a contract, I would unhesitatingly recommend an iphone. It doesn't have to be the new iphone 6...an iphone 5 or even an iphone 4 will be a good investment. I know its fashionable in some circles to diss Apple, but I have been using an iphone since the first one came out and I am a big fan.
The just get and do the job in hand without any fuss at all. Other makes probably do as well but I have no experience of anything other than iphone.
When I order something on ebay, the confirmation comes back to me as an email about 10-20 seconds after I have completed the sale on the ebay screen on my desktop, quicker than it arrives in my inbox for BT Yahoo !
Although, to be fair, anything is quicker than BT Yahoo !