To set up a Wi-Fi hotspot on an Android phone, plug the phone into a power source, open the Settings app, navigate to the Wireless & Networks section, and select Tethering & Portable Hotspot. To turn on the wireless hotspot, check the box next to Portable Wi-Fi Hotspot or Mobile Hotspot. Next, tap Set Up Wi-Fi Hotspot, and set up the name of the hotspot, a password and the type of security for the key. Touch OK or Save.
To create a Wi-Fi hotspot on an iPhone, tap Settings, navigate to Cellular, tap Personal Hotspot and turn it on. Take note of the hotspot's name. Change the password of the hotspot if you feel the need to. If the option for Personal Hotspot is unavailable, confirm with your carrier whether you can create a hotspot with your current plan.
To set up a Wi-Fi hotspot on a Windows Phone, open the App list, tap Settings, and select Internet Sharing. Tap Share Over, select Wi-Fi, and then set Sharing to On. To change the name and password of the hotspot, tap Setup, type the new name of the network in the Broadcast Name field, type the new password in the Password (Minimum 8 Characters) field, and then tap Done.