You might need to restart your router once you have created new password. Then you will have to reconnect all devices to the network using your new password.
A strong password is long (not less than 8 characters) and contains uppercase, lowercase letters, as well as numbers and special characters. You can randomly capitalize a few words or replace some characters with numbers.
Read more: Top 15 ways to Boost your WiFi.
For example, downloading a file from the Internet over a wireless network requires your router to first receive the data via the broadband Internet connection and then convert it to radio waves. Radio waves are then emitted by the router into the surrounding area and the device that initially requested a download receives the radio signal. It decodes the signal and fetches the data.
An older router might also be the reason for a slower Wi-Fi. Read more about the reasons for a slower wireless network connection and possible solutions here.
Once you are in, you'll be asked to enter your router admin password. If you haven't changed it earlier, try a regular "admin" password, or refer to "How to find WiFi password" section of this article.
Every router is made differently, but most of them have an option to choose a different WiFi channel in their settings. If you looked through all the settings and couldn't find this option, try looking through the router's User Manual to see if it has this option and where to find it.
More information here.
If you notice that a phone is connected to your network that no one in your household owns, then it is possible that an intruder is using your bandwidth. If your router allows you to disconnect devices from the network, just do so and change your password right away. And of course, choose a stronger password this time.
A comprehensive WiFi analysis app can help you understand why someone has been able to successfully join your wireless network without being authorized to do so.
Basically WiFi range extenders contain two routers, one designated for receiving signal, another — for broadcasting. Thanks to being dedicated to one exact task, they do, what they are supposed to really well. A WiFi card in your laptop doesn’t measure more than an inch across, while a wireless repeater can measure anywhere from the size of a smartphone charger to a size of an enterprise-grade router.