@Camkawa Did you configure wireless MAC filtering on TD-W8960N? When Wi-Fi security is disabled on W8960N, is there any error when you connect Wi-Fi on your phone?

No... TP-LINK has no such a power bank device. http://www.tp-link.com/en/search/?q=power+bank

Did you login its web interface and check if the dongle can be identified or not? Try to contact India support. FOR INDIAN USERS ONLY (ENGLISH & HINDI SERVICE) Toll Free: 1800 2094 168 E-mail:...

When you try to connect the sixth one, is there any error message if it fails? What are main network activities of 5 Wi-Fi users connected?

http://forum.tp-link.com/showthread.php?82470-TD-W8951ND-wireless-settings&p=166458&viewfull=1#post166458

Leave in default settings. 1- Wireless Mode on what option is set? 802.11b+g+n 2- Channel Bandwidth on 20 / 40MHZ 3- Guard Interval on AUTO 4- MCS on AUTO