- Instability. I need to restart my phone last least a couple times a week, or it will crash and restart itself.
I wouldn't say this is a universal problem to the SGS II as stability on mime as fine on the stock firmware (Euro, unlocked i9100
- No full system backup. No in-app data backup out of the box. Unlike iPhone, you cannot backup EVERYTHING to your computer (let alone to the cloud). You'll have to root the system to do this. But to restore to new phone, you'll need to root that first. Also, I don't know if you can restore data to a different model (SGS vs SGS 2)/OS (ginger bread vs. ICS) of phones.
Music: Google Music. Pictures/videos: Picasa Web via Google+ Apps: If an app supports the backup API, all of the data is backed up to your Google account. Restore works across devices when you login to your Google account
- Find my phone is available but only via Samsung, and it feels like beta. For example, there's no easy to delete a device from the feature. I sold the phone, and it still remained in the account.
There are plenty of alternative applications available that do the same thing available in the Market. You are not limited to Samsung's solution excluseivly
- No need to re-enter password in Android Market to buy apps. Once you entered it once, it stays there. To remove the info, you need to do that in checkout.google.com every single time after you're done buying apps. If not, anyone can pick up your phone and buyapps for you. You get 15 minutes to get a refund, after that you are stuck. (You can do that to your brother's phone to annoy him)
Create a pin no in Android Market settings and tick "use pin for purchases"
- the Social App, which Android is proud of, put all your email, G+, FB and twitter in one place. But it won't allow you to have more than one of the same account. i.e., won't allow 2 FB accounts (one work, one home).
Social hub is a Samsung feature and not an Android feature sadly so it's Samsung's issue to fix.