£60 more and you could have had a Samsung S3....
You should shop here Aaron, I sold a fully working and unlocked S3 over a year ago for £120.
Next week I'll be flogging an S4 and an S5, 6 months and 3 months old respectively.
Both boxed and fully working, although the S4 will be the cheaper than what it should be as I tripped the KNOX counter which means Samsung
may argue over the remaining 18 months warranty should you ever need to call on it.
The Cubot 10 is a good smartphone. Just no instructions. And no after sales care. But what do you expect for £60. 
1. Can I have your dealers name & address, because I'll definitely have some of whatever it is you are smoking

2. No smartphone comes with instructions mate
3. Probably because it's so poor that even the likes of GSM Arena and XDA don't mention it
4. You get what you pay for. In your case you got what (at first glance) looks like a Galaxy S4, but in reality would get blown away by a Galaxy S2 which is now 4 years old in April and essentially extinct by technology standards.
It's probably worth it to give to the kids as a cheap xmas/birthday pressie, but only because they'll more than likely break the screen within a handful of weeks.
The only thing I don't really get is how boosting the mic volume also had the effect of boosting the audio output volume.
I'll await your next post saying your speaker/mic no longer works as the cheap chipset it uses didn't have some form of overload protection built in
