Yes, you can buy the Samsung Galaxy S4 directly from Samsung.
Yes. They have the Samsung Galaxy S4 Active.
Yes, the Samsung Galaxy S4 is a smartphone.
No, the Samsung Galaxy s4 is larger than the iPhone.
Yes, Amazon.co.uk does sell the Samsung Galaxy S4. They have a wide variety of Samsung Galaxy S4 models and accessories available for purchase directly through their website.
The Samsung Galaxy S4 mini is more popular than the S3 mini.
The Samsung Galaxy S4 accepts a micro-SIM, but not a nano-SIM.
An unlocked Samsung Galaxy S4 is presently between $550-650 USD.
The Samsung Galaxy S4 is not waterproof. The Samsung Galaxy S4 Active however is water-resistant, meaning it can withstand water (and dust), but can only stay submerged for 30 minutes for one meter or shallower.
The best examples of Samsung wide phone range is as follows; Samsung Galaxy S4, Samsung Galaxy S4 Mini, Samsung Galaxy S3. They also have other products available.
No, even if you factory reset the Galaxy S4 it will not downgrade.
There are many Samsung phones available. These include the Galaxy S4 Zoom, Galaxy Ace 3, I9190 Galaxy S4 Mini, I9295 Galaxy S4 Active, Galaxy Tab 3 10.1 and many more.