is it possible to make the numbers on the iPhone for dialing phone numbers bigger?

My Dad doesn’t like to put his glasses on for everything he does and he has a little trouble putting in a phone number on his iPhone, is there a way WITHOUT JAILBREAKING to make the numbers bigger? I dont want to resort to Jailbreaking because I dont want to void his warranty, because you know those iPhone, never know if ur gonna need that warranty!!! LOL Thanks in advance!

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