@Hadron bro first of all to much greatful obliged thankful to you for first all sharing you precious time knowledge on reading and replying honestly from hear and soul brother you are great soul thanks a lot god bless. I will try to reply point to point and further give you some questions to help myself and help other viewers in future life to solve problems from our discussion questions and answers hope you don't mind to answer them to. Thanks a lot again brother Hadron.
There's no way you can test all of that with one app (even less a USSD code). Quite a lot of them can't be checked by any app.
* Several of those things cannot be tested electronically, and others which in principle could be (such as number of days used) will surely not be logged anywhere on the device.
@ Hadron bro yes you are right in it may not be possible by one app or one code is it possible with multiple USSD codes or.multiple bechmarking testing apps in have found one for my phone secret USSD code for displaying information it worked partly giving information which I am attaching below there are some code to display service menu of the phone and other information which Company service center or forensic cops easily find which is they roughly get an idea from any one parameter through which they roughly guess the period the first imei number get registered to the first sim inserted on the mobile which make them roughly guess the date the phone was switched on or firstly registered the sim or used.
Secondly I just think the information that a USSD code can retrieve is an is which is saved somewhere in either phone ROM or service provider sever was technically researching that is there service center type app made by third party which can retrieve or snapshot the USSD codes results screenshots or data and electronically save them. If somehow possible in big world.
* The phone will have been reset by the previous owner (unless they are an idiot), so there should be no information on it about what it has been used for previously on the device. So forget about checking whether it's ever been used for crypto or stuff like that.
@Hadron bro yes you are right who is using crypto must be clever and had factory reset the info before selling or sending to us and will never tell us info and try best to hide it . That's why want to verify at the seller end it may in different country or state or city what I want is on the seller end want any parameter value ( may be cpu benchmark or any crypto leftovers) through which without knowing the seller in can get an rough idea from USSD code or any bechmark app like cpuz that device had been optimised used and is depreciating now and been malused or.malfuncting any error logs saved in ROM or any place which can we get an rough idea so that we can reject or confirm the deal
*Water damage can only be tested by opening the phone and inspecting the colour of the moisture indicators, which even then is only an indicator of moisture ingress rather than damage. To assess actual damage you'll need to disassemble the phone and closely inspect every component.
@Hadron bro you are right that the water damage is detected after unscrewing de-assamble mobile phones as it quite obvious that the the phone is working and switching on and if ask some video current screenshot from seller or how you suggest the way we confirm our of country customer selling phone is not dead is in working condition. If we confirmed that it's in working condition that it may be repared from water or any damage may be display changed or any part soldered changed badly within local market. As in many electronic gadgets the service center enginer used to guess t that the device is open through missing screws or some marks on screws or sealed broken but in mirdern smart phone world they digitally confirm through some in built body opening sensor record or any values saved In ROM and think it can be readed through any USSD code or some service centers engineers manufacture softwares in samsung or any other phones
* I don't know what you mean by "current life of mobile" as opposed to "current battery life of mobile". And nothing you install can tell you the current battery life: you can find out the current battery capacity, but that doesn't tell you the battery life (which in any event depends on usage pattern, whether you typically use it in good or bad coverage, so will be different for you from the previous owner).
@Hadron bro you are right no one can judge how much life remaining any part can survive or live. But by current mobile life i mean to say by any parmeter like in desktop computers we guess find the heavy duty work done through its hard disk usage or cpu usage report through bechmarking tools. So in case of mobile can we judge the display or CPU or RAM or internal memory or battery can we guess it's hourly load used or how much heavy usage is done so that we can get any value.either by multiple USSD code or by multiple cpuz in ir bechmarking analysis apps.
Things you do want to check:
* That you can boot the phone up without it asking for the previous owner's login details. If the previous owner doesn't understand about factory reset protection and simply reset it without removing their account first then you won't be able to use it without their login details, and you don't want to find that out after they've left with your money.
@Hadron bro yes you are right once I stucked with my own mobile as it I opened friends email id and just reaeer the mobile for Google email locked system but I have tried once with my mobile phone with bypass or reset FRP technique which erased or bypassed the Google account but it wa along technique and time consuming but it's tough to give other country seller our gmail id and password to register before parceling to us yes we can make a temporary fake gmail id with password yes nice point told to remeber thanks a lot again.
Things you do want to check:
* If you want to check its system software hasn't been modified, your best bet is to boot into the bootloader and check whether it is locked, unlocked or relocked. If the phone is a Samsung you can also check the Knox status. How you do these things varies between manufacturers (also with some phones it's possible to reset the bootloader to "locked" rather than "relocked" if you know how, so that isn't foolproof on all phones).
@Hadron bro yes you have told right many mobile phone phones with techies ia being rooted and locked the bootloader and played with system settings to boost many options or may be in used for hacking to... As rooted or unlocked phones are unrooted easily or unlocked can be locked. Still lastly we can flash the mobile with original stock rom which can easly erase all modification does flashing with original stock rom lock bootloader again or not don't know
* If you want to be absolutely sure there is no spyware etc installed in the system you want to reflash the phone yourself with a new set of stock software. That will overwrite the existing system and hence any nasties that might have been added. A factory reset will eliminate software in the user space, but doesn't touch the system software. It should be very hard to install spyware to the system without root, but this is the way to be certain. Note that how you do this, and whether you can get the necessary software for that particular model, depends on the manufacturer, so do your research first. Often phones won't let you install software older than what's already installed, so check that you can access up-to-date software for the particular model as well.
@Hadron bro yes rooted or modifiedd stock roms can be reflashed with original stock roms from manufacturer service center paid service to and by self i had tried to create own stock rom system.img backup stock rom through adb pull and retrieved flashed through adb shell dd of commands and fastboot flash but online stock rom version availability is doubtful wether those stock rom versions are latest or not been modified is an not 100% sure. But can does flashing with original stock.rom can diminish chances of erasing all hidden data within ROM is there any chances of stains or leftovers of rooted or modified or spyware after flashing?
* You need to make sure that the phone is legitimate (this is much more important than any of the things you list). In particular that includes checking that if they bought the phone on a contract with a service provider they have completed the contract period or paid off the contract. If, for example, they take out a contract with a free or heavily subsidised phone, sell the phone to you a couple of months later and then stop paying the contract the service provider will blacklist the handset so that it cannot be used on any network. Phoning them up to say that you bought the phone from someone else and this isn't your fault will not help, they will not remove the blacklisting for you because as far as they are concerned this is a stolen phone (stolen from them, as the seller hasn't paid them for it yet), and if they were to remove the blacklist then they have no way of stopping everyone doing this. So you don't want to allow this to happen because it will be up to you to get your money back from the seller if it does, and you'll get no help with this. So if you have any reason to think this might be the case meet the person at one of their service provider's stores so that they can confirm that the handset is not under contract. If they refuse to do this, don't buy the phone.
@Hadron bro greatest advice I had never thought of the stolen part good advice to cross check the imei number wether it stolen or blocked or not where we can cross check kindly suggest the best legal site in India. But the theft are smart to they change imei number of the mobile how can verify its working if the seller.is in different state in or country or city we can't put sim inside the phone as seller.are far from reach and in this wicked world its tough to trust on words the cautious for verification is better
@Hadron bro atlast again Lotz Lotz of thanks a.lot again know my reply is too long but still tried to honestly reply to your answer hope you will correct my mistakes and understand me better and guide me always thanks a lot brother.
