A continuación un video donde se explican los pasos principales de todo el proceso. Espero les sea de utilidad.
Como recomendación, leer las guías y tutoriales publicados anteriormente relacionados al iPhone
This is the best Jailbreak & Unlock for the iPhone 3GS. Better than redsn0w and ultrasn0w.This tutorial goes out to 3GS users who have had problems jailbreaking with redsn0w, ultrasn0w, or purplera1n. The problem is the compatibility issue. In this video I will be using Purplera1n and Purplesn0w. Purplera1n jailbreaks the 3GS and Geohot released on July 13, purplesn0w which unlocks and is lighter and takes less battery than ultrasn0w. Using purplera1n and purplesn0w together will solve all wifi, battery, connections problems.
Step one- Go to www.purplera1n.com
2- Download for Mac or Pc then open file.
3- Click “make it rain”
4- Open Freeze and install cydia. Reboot.
5- Add apt.geohot.com to sources
6- Install com.geohot.purplesn0w
7- Turn 3G off and reboot.
8- Insert SIM and enjoy.
If you previously jailbroke your iPhone 3GS and have problems then you should restore it to original 3.0 Firmware. Download with Firefox to get in IPSW