My iPhone15 pro max

The iPhone 15 plus pro max isn’t what it’s cracked up to be! Is anyone else having issues with the text messaging keypad? Maybe the problem is with the width of the phone? I am constantly switching the keypad to numbers with the palm of my hand. I purchased this phone and right away I had my doubts but waited too long to return it. I’m also having issues with one letter text messages. Just the first letter of the first word in the sentences show up.