it depends on which phone you buy that certain models have large screens. my samsung Galaxy note 2 has a 5" screen, (last year's model, now there is a note 3), Ann has one that is even bigger.
they are all quite inexpensive and you are entitled to some sort of rebate. I found the best price through the Amazonians, they have all the carriers, if the price drops within 30 days, they credit your account too. it is simple to set up and transfer your contacts, email, etc. if i can do it, anyone can.
so he is going to come back after this with more $$ and the cycle will repeat...then you will still be in the same place. it is good that you can discuss and compare notes with your sister, but it might be time to stop babystepping and wobbling and start jumping a little and jogging. (burns much more calories).
Like I said, practice on little miss BadNotes, let your fur fluff out a bit and be strong.