reddit

“In the "old times" users of the firmware 1.x could only use either applications bundled by Apple (not too many, mostly Safari, Mail, Calendar, Calculator) or use "web apps" through the mobile Safari browser. Of course clever developers (hackers) found a way to install 3rd party apps on iPhones. It required the user to "jailbreak" the phone, often also combined with "unlocking" (making cellular network-independent). It is being estimated that about 10% of 1st generation iPhones were unlocked in the pre-3G era.” source...