Push Notifications is perhaps one of the most useful services implemented by Apple in iOS because it gives us the opportunity to always be notified about any kind of news from the information provided by the applications installed in our terminals. Push Notifications notifies us when we receive an email on Yahoo/MobileMe and more recently Gmail (through the Google Mobile App), notifies us about messages received on social network accounts or news from games installed on the phone. Although sometimes it can be annoying, the Push Notifications service is useful and keeps you informed when needed.
A big minus of this service is the fact that during operation it consumes a good part of the battery, practically if you have several applications open and Push Notifications on, then you risk consuming your battery in a fairly short time. Push Notifications checks every 15/30/60 minutes (for the mail application) using the Internet if there are updates for the applications that have this service turned on, and this constant check leaves its mark on the battery autonomy, which decreases with the naked eye. Practically, more applications with Push Notifications open means much less autonomy for your phone.
A second big minus, which applies only to those who have a jailbreak, is the impossibility of using this service if you hack. Practically, when activating the phone with the operator's card, through iTunes, you receive a unique identification code that is used by the Push Notifications service to function. Hacktivation does not provide this code, so the Push Notifications service does NOT work, the only 100% functional solution is to install the Push Doctor application from Cydia.
I don't use the Push Notifications service because I don't always need to be aware of something and I choose to be able to use the phone for a longer period of time, to the detriment of using this service.
