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Why my android tablet cannot connect wifi?

How to disable wifi and enable wifi on my android tablet?

On your Android Tablet, you have to do this to enable and disable Wi-Fi:

1. Go under Settings. There might be a shortcut icon on the Home screen or you might have to go under the apps menu and find settings. (To get to the app menu, press the Menu button while on the home screen or click the arrow on the right.)
2. Click on Wireless Controls.
3. Make sure Wi-Fi has a check that's not grayed out. If not, just press the check.
4. Click on Wi-Fi settings.
5. Find a Wi-Fi network that you can get into. Then click on it and connect. If there aren't any networks available, you will not be able to get to the internet from where you are.

I did the same as you said, but I am still cannot connect wifi??

(Before you read below artile, pls try to reset your wireless router, then reboot your tablet, switch the tablet's wifi off and on again, most time, it will work.)

There are several possible issues and, of course, ways to overcome them.

1. Security block

This is often the case when the tablet can see the network and is showing a good or excellent signal yet, just refuses to connect. The easiest way to get around this is to switch off all security but that is not practical obviously. The perfect cure is to allow MAC address filtering, sometimes called MAC address control. Effectively, you input the tablet MAC address into the security setup menu on your router and this gives the tablet a free pass to get past all of the routers security features. This blocks out all other devices from gaining entry to the network however so remember to add the MAC address of your smart phone, laptop, xbox etc etc. For instructions on how to do this, see your routers manual or speak to your ISP.

2. Network Congestion

This is the focus for BTs new ad campaign touting the merits of it's new routers' abilities to filter out network congestion. The effect of too many wireless signals from competing networks spoiling your network signal. Android Tablets seem particularly susceptable to this. The rest of your devices may work fine but the tablet keeps dropping out or shows very low signal even when sitting on top of the router - a favourite complaint I hear all too often. Cycling to a different channel frequency can help significantly and many people see their signal jump from "low" to "excellent" just by the flick of that virtual switch. Cycle throuigh all 11 frequencies until you find the one that works best with your tablet. This is unlikley to affect the rest of your devices in the house. A good idea, also, is to download one of the many WiFi Analyser apps (search on android market or on internet by "wifi analyser")  or programs for your tablet / desktop computer as this shows which channel has the best signal / lowest congestion.

3. WPA / WPA2 Security

This is undoubtedly one of the safest security protocols for your home network but it can be TOO safe for your android tablet and downgrading to something like WEP can make all the difference between connecting to the network and not connecting. This is extremely rare however, to find this being an issue. Again, MAC address control can get the tablet through the block if you do not wish to downgrade to WEP.

4. Damaged Hardware / Software

This is commonly shown by having no network signal whatsoever. Of course, this is always a possibility particularly with mail order tablets when the postal / courier services are less careful than they should be. Flash memory devices are particularly volatile in this respect and the software can turn up corrupted due to a bump in the post but it is easy to cure them - in fact, they are designed this way. If your tablet has custom firmware, contact DracoTek and get the firmware from them and re-flash it - most android tablets are very straight forward to flash (although the novice will disagree, at least until they have tried it). If the tablet does not have custom firmware, try resetting the factory settings. In android this is usually found in the SETTINGS - PRIVACY - RESTORE FACTORY DATA menu.

Hardware failure is actually the least likely cause of a network connection problem - it is so rare that it is easy for the likes of me to discount it although that is wrong because it is not impossible. In this case, you should return us your tablet under warranty for exchange or repair, we will be happy to help you.

Summary :

Most Android Tablets only have the range of b / g certified devices

WPA / WPA2 Security protocol may be too much for your little friend to overcome.

Whenever you make any changes to tablet or router settings, reboot BOTH devices for the changes to take effect !

Only 1 out of 20 tablets brought in to our repair centre actually displayed a fault - the rest were one of the above configuration issues so don't GIVE UP on your tablet !