** once the Speed Check limit 1 is exceeded, Download bandwidth drops to 512 Kbps.
*** once the Speed Check limit 2 is exceeded, Download bandwidth drops to 64 Kbps.
http://www.dialog.lk/personal/broadband/fixed-broadband/packages/4g-lte-packages/
you should be able to see it in the router page?
for better security, use a strong password. use the best encryption method available, create a while list of MAC addresses and additionally you can hide the SSID (some says hiding SSID is useless though)