Help to make the right choice

[turalo]

Hi guys.
First of all, I have searched the forum, and also used google, but most of info is not fresh and is not really complete. So please excuse me in advance if I"m asking a question that is partially asked before.
And Please before you reply, I ask you even, I beg you please only reply if you have a constructive informative things to say. Please dont come with sarcasm etc... This is a very serious thing for me.

My project :
Have a android phone for only 1 APP and with Only VPN / TOR connection. So Basicly imagine a android phone that has only 1 app. When that app is in use, communicating it comunicates true vpn maybe TOR.
This phone will not be used for anything alse. Only 1 APP. The APP is a VOIP app, so it will make calls true a external server. The internet will be on the simcard, simcard will be used wich has no Telephony services but only internet services on it. So it must be really basic, not to cheap not to expensive. No other apps will be used. Actually if possible all apps will be removed. and will be locked down, so you can only start, unlock, start app call / recieve calls. turn of.

Now, the Questions
1. What is the most Secure Android ROM, that would work on most / many android phones.
1.1. I want to LOCK the rom / android completely after install and setup settings, sothat nobody can install anything anymore.
1.2. The rom must be light, sothat it's fast and also not to heavy on the battery.
1.3. Posibilities to add extra options like self distruct if 3 times wrong unlock code is entered, like Iphone.

2. What phone would you recommend to do this job, Please keep in mind, it should be not to small, sothat it's nice to use. sits nice in the hand of a grownup person.

 

[turalo]

Nobody ?

 

[turalo]

So... No reply at all ))

I did a little research, found out i can strip down the firmware, just build it / rebuild it from source or just make some edition, I'd still like to hear / read some advice about wich phone model to take.

 

[zelendel]

If you are gonna build from source then your best option is a nexus. Other wise you will end up having issues with device trees and kernel source.

As for locking it down well that's another matter. As long as they could get access to the device there is more way to stop them completely.

 

[turalo]

If you are gonna build from source then your best option is a nexus. Other wise you will end up having issues with device trees and kernel source.

As for locking it down well that's another matter. As long as they could get access to the device there is more way to stop them completely.

Thanks for your reply / info.
for the lockdown, it's more like anti kids lockdown, sothat users cannot install just what ever they want. But I think it will be more advanced than that.
I'm planing to make a clean, light, firmwar that will :
1. have only 2 ways of comunicated. 1. Secure VOIP 2. secure chat system like tox or something.
2. will comunicate only true VPN or TOR
3. Will be locked down after initial setup. meanin will not be possible to install anything, just set options like wifi etc... no apstores.
4. Will have self distruct software, that counts how many times wron pin / screen unlock is done, if more then 2-3 will completely wipe itself to empty device.
5. by default camera, gps, proximity, will be absent, so will be removed in ROM, so will be really not functional.

sofar
tomorrow will search for a nexus.
thanks for your advice again.

 

[turalo]

If you are gonna build from source then your best option is a nexus. Other wise you will end up having issues with device trees and kernel source.

As for locking it down well that's another matter. As long as they could get access to the device there is more way to stop them completely.

Nexus, like any nexus ? cause there are many, lg nexus, samsung nexus, etc...

 

[zelendel]

Nexus, like any nexus ? cause there are many, lg nexus, samsung nexus, etc...

Well that depends on where you want to start. You can get an older nexus where all the code is pretty much there for stuff and learn that way. Or get a newer one where things are still being changed around. Let me give you one warning. With ever yearly android release you pretty much have to rebate everything you did and start from square one.

 

[turalo]

Well that depends on where you want to start. You can get an older nexus where all the code is pretty much there for stuff and learn that way. Or get a newer one where things are still being changed around. Let me give you one warning. With ever yearly android release you pretty much have to rebate everything you did and start from square one.

Thanks for all advise, info.
I have done first tests, went with basic samsungs. s4 mini, have installed edited cyanogen, all tests went well, now testing self distruct mechanism.