"Comfortable grip" refers to the way a handle or surface feels in your hand, where it is easy to hold and use with little effort or strain. Full definition
To accommodate this, the corners are now curved which, as you'd guess, yields a more comfortable grip for handling the slightly taller phone. (techpp.com)
The smartphone will provide comfortable grip and leave a stunning visual impression. (techandroids.com)
Further, it offers comfortable grip when you hold it in your palm. (indabaa.com)