To install unsigned or old IPA files on iOS 4.2.1, your device must be jailbroken. You will need to install a tweak like AppSync Unified
: This version is stripped of the complex "World Tour" events and endless menus. It’s just you, Jake, the grumpy Inspector, and the tracks. The lightning-fast swipe acrobatics feel surprisingly responsive, even on a screen that’s seen better days. Performance Quirks : Be prepared for the occasional framerate dip Subway Surfers Ipa Ios 4.2.1 BETTER Download
: If you previously "purchased" Subway Surfers on your Apple ID, you can sometimes go to your To install unsigned or old IPA files on iOS 4