@KelYco Hi, if you just want to power on TP-Link DSL modem router, you may consider to use it to replace your main modem/router(from ISP). If you decide to connect TD-W9970 to your main modem/router,...

@Newbie_Richard Hi, thanks for posting question here. You may refer to this article to know more. And both crossover cable and standard Ethernet cable should be ok. If two PCs connected to the same...

@rit_99 Hi, welcome to our community. QoS (Quality of Service) is an advanced feature that helps you set priority for specific applications and devices so that they can perform better with lower...

@otnemem Hi, welcome to our community. May I know who is the ISP of your SIM card? Can the same SIM card work properly on your phone if you also reboot your phone? Here are some suggestions for your...

@poplars Hi, welcome to our community. It is sincerely suggested to follow this guide to troubleshoot: What should I do if my TP-Link 4G LTE Router cannot detect SIM card?

@Craige_Davido Hi, thanks for posting question here. It is suggested to upgrade firmware to latest according to the official website, then check again. If 4G+ still does not work, please share who is...