Easy and useful way to increase, Wi-Fi signal range
Normally laptop can catch the Wi-fi signals more then smartphone. The reason of this problem is smartphones signal antennas are small then laptops antennas. Some Wireless routers have many antennas and some had only one.
If you can access router setting penal then you can increase the Wi-fi signal range. Default setting TX Power set at 60 or 70 you can write manually 100 values. But keep in mind with doing this your router will heat more then normal position and try to keep away minimum 6 feet the router from microwave oven, cell phone, Bluetooth devices, wireless keyboard, wireless mouse, wireless headphones because wireless technology product decrease the performance of each other.