iPhone 6S have now less then year and still have some steam. It's equipped with Apple A9 SoC with 2 cores clocked at 1.5GHz and 2GB of RAM so it have some power. As always Apple made other SoC producers jealous with phone scores and big contribution with this have usual for company hardware-software optimalisation. Android just isn't able to do this.
As always with iPhones quick info: before ordering our service check blacklist (you can do it via link below). Many second hand models are simply reported as stolen, lost, damaged or the bills where not paid for the contract.
Our iPhone 6S unlock service is simple and all steps are described on site and prices starts with 9.99 EUR - remember to choose good carrier!