Iphone can't connect to Wi-Fi? - 2

My iphone 4 running on version 6.1.3 suddenly stopped automatically connecting to my home Wi-Fi. My laptop is connected fine though.every time i click it says unable to connect. So far i have:
-turn Wi-Fi on and back on
-turned my phone off completely and back on
- pressed forget this network
-pressed reset network settings

now i have to re enter my Wi-Fi password.still unable to join network even with correct password. I'm not sure what to do now

Follow these steps to troubleshoot the above issues.

1. Be sure that you are in range of your Wi-Fi router (access point).
2.Tap Settings > Wi-Fi and turn Wi-Fi off and then on again.
If unable to do so, see this article.
3.Confirm that your Wi-Fi router and Cable or DSL modem are connected to power, turned on, and indicate that they are connected to the Internet.
If not, refer to your network administrator or ISP for assistance.
4.Restart your iOS device.
5.Tap Settings > Wi-Fi and locate the Wi-Fi network to which you are connected. Then tap The right arrow button and Forget this Network. Try to connect to your desired Wi-Fi network again.
Note: You will need to enter your Wi-Fi password again if your desired network requires one.
6.Turn your Wi-Fi router off and then on again2. If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
7.Update your device to the latest version of software.
8.Update your Wi-Fi router to the latest firmware2.