Be aware that the Chinese dual sim phones that I've looked at (and I
own one) have a lovely little piece of spyware by default. They can install anything they like with this on board and also read text messsges etc.
Shanghai Adups Technology – which is the said software company in question, has affirmed that the software meant for a Chinese manufacturer was erroneously included on the devices meant for the US.
the droidreview
Kryptowire has identified several models of Android mobile devices that contained firmware that collected sensitive personal data about their users and transmitted this sensitive data to third-party servers without disclosure or the users' consent.
Kryptowire
If you can root the phone then you can delete it if not the there does appear to be a way of disabling it.
https://android.gadgethacks.com/how-...sable-0175034/
I've not tried this and can't say if it works but I know that using Noroot firewall didn't stop it updating the spyware. My antivirus now tells me there is a PUP (Potentially Unwanted Program) on my phone which is the updated version of ADUPS FOTA and that it can't be removed.