I have a pretty high res image for each and every one of my contacts in Adress Book, but still, if someone calls me, I only see a thumbnail of their picture on the iPhone screen ...
Solution?
If you have transferred contacts, say from a nokia phone the pictures will be small.
If you add the pictures from your mac or mobileme, they should be big.
In the adressbook on your mac, you should be able to scale the picture
Have you set the images on your computer or on the phone.
Ones set on the computer often show up small.
All of them were added on my Mac ...
Is there any way to extract the pictures from Address Book and re-add them on the iPhone, so they'll show up 'big' ?
Alright, apparently not.
I'll have to set new images for each and everyone of my contacts directly from the phone then ...
Does anyone know what the resolution has to be for it to display it as a big picture?
Set the contact picture on the phone (from an image in your phone's photo library), not on the Mac, for a large full-screen caller picture.
Setting the picture in Address Book on the Mac, no matter how you sync, will give you a small picture on the phone.
This works consistently for me.