WiFi Connection Manager is the best Wi-Fi scanner manager and connector on android.

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NOTE: According to the change of Google Play Mobile Ads policy devices before Android 2.3 are no longer be supported.
Legacy devices can download the app from: http://www.roamingsoft.com/android/WifiManagerLegacy.apk

1. Support AP (Access Points) SSID with special characters such as Chinese Japanese Korean Greeks Russian Arabic Portuguese UNICODE and so on.

2. Display saved network password. (require device to be rooted)

3. Fix device Wi-Fi problems.

4. Instant connect. Once searched once start connecting. Way faster than the system build-in Wi-Fi scanner.

5. Static IP settings support. Auto switch between different AP.

6. Switch between available networks solving the network conflict problem.

7. Add/Connect to certain hidden SSID network (depends on device and network conditions).

8. Manual add network with special support for EAP/LEAP encrypted network.

9. Pause scan convenient to browse many results.

10. More detail network information network bandwidth channel and network type.

11. Auto detect Web Authentication.

12. Backup/Restore saved networks.

13. Add/Share Wi-Fi network with QR code.

14. Arrange network connecting priority.

15. WPS (Wi-Fi Protected Setup) support for Android 4.0 or above devices.

16. Automatical switch between saved networks when signal is not ideal.

17. Wi-Fi tether (Wi-Fi Hotspot) support.

About the required permissions:
Camera is for adding Wi-Fi network via QR code.
Phone and Internet is for the AdMob plug-in made by Google.
Storage is for backup and restore saved network.