Moving apps to SD card/Uninstalling default apps on my ZTE Blade (2.3.5 Gingerbread)

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http://forums.androidcentral.com – Hello! I have an old ZTE Blade running Android 2.3.5 and as most of you probably know this phone does not have much internal storage memory, just 150 MB, wich brings me to my problem. I'm wondering why there are so many apps that I am unable to move to my external micro-SD memorycard (for example Facebook and Gmail)? I already moved all the apps that I could (for example Skype and Sportstracker) to my memorycard but I would really like to move a few more, preferably without rooting. Is this at all possible or are they absolutely locked to the (tiny) internal memory? Alternatively I woul (HowTos)