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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!

Public Comments

1. nah thats why the phone kinda sucks...
2. you cant only if you jailbrake it, but it could go wrong