I got a beta firmware for this issue from TP-Link tech support: http://support.tp-link.com/f/3481a276a2/?dl=1 This is a beta firmware to solve the fault on daylight saving time, which sounds like the...

As far as I know, it is not possible. As you can see from the modem's web UI, you can either choose DSL WAN, or Ethernet WAN.

search it online? like amazon? most adapters are sold in pair.

most clients usually will automatically choose the stronger signal one to connect when several access points are using the same ssid. you can see this how to build a roam network....

you can see this TL-WPA8630KIT, it has good review on amazon, i think. https://www.amazon.co.uk/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=TL-WPA8630 http://uk.tp-link.com/search/?q=8630

first, Check with your 3G/4G service provider to make sure that your SIM card support below bands. 4G: FDD-LTE B1/B3/B7/B8/B20 (2100/1800/2600/900/800MHz) TDD-LTE B38/B39/B40/B41...