I started with Android FROYO 2.2.1 which was really simple to root and customize, not to mention just how easy it was to tether. I'm currently running Android Kit Kat 4.4.2 rooting and unlocking the bootloader is a little more difficult and tethering is hit or miss depending on which phone you have. I have been through every version of Android since 2.2.1 (except Honeycomb) and it's been a nice ride watching this OS grow up.
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Sent from my HTC6435LVW using Tapatalk