How to solve if there is no network when plugging in a T-Mobile or AT&T SIM card?

Go to Advanced>IPv6 to enable it; Go to Advanced Settings>TTL>Custom and set TTL to 64, HL to 65; Go to General Settings>3G/4G , set APN profile as Manual, set APN as VSBLINTERNET, leave username and password as blank, set authentication as PAP+CHAP

How to acquire the T-Mobile & T-Mobile B2B Static IP?

Go to General Settings -> 3G/4G, set Network mode as 4G only, set APN profile as Manual, set APN as fast.t-mobile.com (Note:for static IP plan, set APN as b2b.static ), leave username and password as blank, and set Authentication as PAP+CHAP.

What should I do if the issue still exists?

Please upgrade the firmware of the LT400 and try again. Or contact cudy support for help.

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Cudy 4G LTE Cat 4 N300 Wi-Fi Router, 4 Fast Ethernet Ports, LT400

Product ID: 356633747

Details

Brand
Cudy
Colour
Black
Compatible devices
Laptop Tablet
Connectivity technology
LTE Wi-Fi
Frequency band class
Single-Band
Included components
Ethernet Cable

🌐300 Mbps Wi-Fi 4 dual-band

📶150 Mbps LTE Cat.4 speed

🔌4x 100 Mbps Ethernet ports

R2627

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Power your digital life with lightning-fast, secure 4G Wi-Fi—connect smarter, live better!

ROBUST MULTI DEVICE SUPPORT - Supports up to 30 devices simultaneously with stable 300 Mbps Wi-Fi 4 and 4 Ethernet ports—perfect for home office or smart living.
SEAMLESS 4 G LTE CONNECTIVITY - Instant internet via Nano SIM with blazing 150 Mbps download speeds—stay ahead, always connected.
ENTERPRISE GRADE VPN SECURITY - Built-in WireGuard, OpenVPN, and more for secure remote access—your data fortress on the go.
UNINTERRUPTED INTERNET WITH FAILOVER - Auto WAN/WISP/Cellular failover guarantees zero downtime—because your workflow can’t wait.
SMART PARENTAL CONTROLS EASY MANAGEMENT - Manage screen time and network settings effortlessly via the intuitive Cudy App—control meets convenience.

The Cudy LT400 4G LTE Cat.4 N300 Wi-Fi Router delivers up to 150 Mbps download speeds via a Nano SIM slot, combined with 300 Mbps Wi-Fi 4 and four 100 Mbps Ethernet ports. Designed for seamless connectivity, it supports up to 30 devices and features advanced VPN protocols for secure remote access. With automatic failover and parental controls, it’s ideal for home offices, smart homes, and mobile setups requiring reliable, secure internet without wired broadband.

Specifications

ASIN	B085S2147W
Antenna Location	Business, Home
Antenna Type	Fixed
Best Sellers Rank	4,283 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 35 in Routers
Box Contents	Ethernet Cable, Installation Guide, LT400, Power Adapter
Brand Name	Cudy
Colour	Black
Compatible Devices	Laptop, Personal Computer, Smartphone, Tablet
Connectivity Protocol	Wi-Fi, 4G LTE
Connectivity Technology	LTE, Wi-Fi
Control Method	App
Controller Type	App Control, Web Interface
Country of Origin	China
Coverage	extended
Customer Reviews	4.3 4.3 out of 5 stars (6,244)
Data Transfer Rate	300 Megabytes Per Second
Frequency	2.4 GHz
Frequency Band Class	Single-Band
Has Internet Connectivity	Yes
Has Security Updates	Yes
Is Electric	Yes
Is Modem Compatible	Yes
Item Dimensions L x W x H	23L x 14.6W x 21H centimetres
Item Highlight	Cat.4 150 Mbps DL, N300 wifi 4, Nano SIM Slot, VPN: WG/OVPN/ZT/PPTP/L2TP, WAN/WISP/Failover, Cable Incl, profess
Item Weight	205 Grams
LAN Port Bandwidth	100 megabits_per_second
Manufacturer	Shenzhen Cudy Technology Co., Ltd.
Manufacturer Part Number	LT400
Maximum Upstream Data Transfer Rate	50 Megabits Per Second
Model Name	LT400
Model Number	LT400
Number of Antennas	4
Number of Items	1
Number of Packs	1
Number of Ports	4
Operating System	RouterOS
Other Special Features of the Product	300 Mbps WiFi, 4G LTE FDD&TDD, DDNS, VPN
Product Warranty	2-Year Warranty
RAM Memory Installed	64 MB
Router Firewall Security Level	Advanced
Router Network Type	hybrid
Security Protocol	[INF] Supports security protocols through VPN clients
Unit Count	1.0 count
Voltage	12 Volts
Wi-Fi Generation	802.11n
Wireless Compability	2.4 GHz Radio Frequency, 802.11n

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TrustScore 4.5 | 7,300+ reviews

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R2627

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

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TrustScore 4.5 | 7,300+ reviews

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