Same boat as you, except that my phone isn't really overdue yet.
Being an android guy, I have always resisted getting iOS stuff. I have had crashes of my Nexus 5x and Nexus 7 2013 almost every flight. Mostly not serious (the app freezes, but the drone is fully controlable still, and I have only flown LOS until now), but they make me nervous all the time, so I am now contemplating getting an iPad mini. I would actually prefer something smaller, 6" would be ideal, but I am not willing to pay for a new iPhone 6/7 plus. On the other hand, if you are willing to spend a 1000 bucks on a phone anyway, I would now go for an iphone.
For me, the situation is the following:
1. It MUST be stable
2. If possible, about 5.5 - 6 inch diagonal is preferable
3. Preferable < €500
4. I am not too worried about using a dedicated device for the mavic, as long as it is portable
Right now, I am on the fence between an iPad
mini 2/3/4 or waiting for the
crystalsky to come out...