If you are the owner of a hackivated iPhone today seems to be your lucky day as Push Doctor for push notifications has arrived via Cydia. Push Doctor supplies you with true activation certificates so unlike other workarounds, certificates are always unique.
Push Doctor is completely free and can be found on the NERV repository (http://www.cmdshft.ipwn.me/apt/) which you must add in Cydia. Keep in mind you will not see any application on your Springboard as all it will do is add certificates to your device. If you do give this a try remember to be patient as the server has been getting hammered all morning and push notifications may not work right away. So if you get any sort of error on install, simply try again at a later time.
Let us know how it's working for you in the comments below!