Rebranding Android 1.6

What is some advice to re-branding an Android phone (Android 1.6). My goal is to limit its functionality. For example, only make calls possible to a specified number as well as its messaging feature, change its boot animation, disabling any extra feature.

Can I do that using an "application", a开发者_运维知识库nd of course, I'm concerned about its security, meaning that, this "application" cannot be removed. Well yes, re-flashing the phone is out of my security concern. This application should start and taking over the system when it is started up.

You can't do this with an application. You'd need to build your own customized system image for the device and flash that on to it. To be able to do that, you need to have the hardware drivers and other support needed to make a full working system image. You can look at CyanogenMod as one place to see if someone has put together a working system image for it, but for something down to 1.6 it seems unlikely to me. Most people are trying to get newer versions of the platform to run on their devices, not old ones.