The website iFixit, which publishes guides and rates the ease of maintenance of various devices, including mobiles, has given to Samsung Galaxy S7 only 3 points. That’s slightly more than what received the HTC One M8 and M7, considered historically most difficult to dismantling devices.
Technicians from iFixit however, point out that the difficulties of dismantling are due to largely cause of waterproof feature of the device – so therefore something for something.
The casing of the phone is glued, and is dismantled without a screwdriver to which you have to use heater on the glue and suction cups.
When you peel off the back wall, you can remove the antenna – and have access to the battery. The battery is glued and combined with tapes with the motherboard.
In summary removal technicians iFixit decided that some parts of the phone can be replaced fairly easily, but the dismantling of the display without damage is almost impossible.