So a few months back, a coworker and I were curious how the iPhone text message badge would handle large numbers of text messages and how the phone would react. Basically, my coworker wrote up a program to send texts to my phone via email. (Fun fact, gmail only allows 500 sent messages a day ) After a few weeks of spamming my phone, it felt like my phone was getting slower with the crazy amounts of unread texts. So anyway, here are the pics. iPhone was running 3.1.2 (maybe 3.1.3) As you can see, it craps out after 9,999. Even 10302 would look like 10...2.