As you would expect from a company focused on connecting people, we prioritize antenna performance over physical design if they are ever in conflict. In general, antenna performance of a mobile device/phone may be affected with a tight grip, depending on how the device is held. That's why designs our phones to ensure acceptable performance in all real life cases, for example when the phone is held in either hand. Nokia has invested thousands of man hours in studying how people hold their phones and allows for this in designs, for example by having antennas both at the top and bottom of the phone and by careful selection of materials and their use in the mechanical design