Can Wi-Fi work while LTE internet is down?
Yes. Wi-Fi is the local connection to the router. The router still needs a working SIM, signal, APN and plan to reach the internet.
LTE routerLTE routerWi-FiAPN settingsSouth Africa
LTE router APN settings South Africa
Use this when an LTE router has a SIM inserted but will not connect after changing networks, replacing a SIM or buying a second-hand router. The APN must match the network on the SIM.
Quick Answer
Meaning
The router may be trying to connect with the wrong mobile-data profile.
Most likely cause
Old APN saved from another network, blank profile, locked router, inactive SIM or account-specific APN requirement.
First thing to try
Log into the router dashboard, add a new APN profile for the SIM network, save it and restart the router.
Contact
Contact your mobile network or router provider if the SIM, plan, account, device lock or hardware warranty may be involved.
Reviewed by Riccardo Vallaro, Telecom & Mobile Services Specialist
Last reviewed: 20 May 2026
Sources we check: General consumer troubleshooting patterns, DataCost internal guide links, public provider self-service concepts, and South African prepaid user needs.
Why trust this: Guides are based on public operator pricing, USSD flows, official support pages, and South African prepaid user needs.
Found outdated info? Send a correction.
What It Usually Means
- A router can have Wi-Fi working locally while the LTE internet connection is still down.
- SIM status, APN profile, signal, plan status and router firmware can all affect browsing.
What to Try First
- Confirm which network the SIM uses: Vodacom, MTN, Telkom, Cell C, Rain or another provider.
- Check SIM status and data balance before editing APN settings.
- Add a new APN profile instead of deleting the old one immediately.
- Restart the router after selecting the new profile.
Step-by-Step Fix
- Log in to the router dashboard using the address and admin details on the router label.
- Open the mobile network, profile management or APN settings screen.
- Create a new profile named for the SIM network.
- Use the APN recommended by the official network support or DataCost APN guide for that network.
- Leave optional fields blank unless official support gives you account-specific details.
- Save, select the profile, restart the router and check whether the internet light changes to connected.
When to Contact the Provider
- The SIM works in no device or the router reports SIM not detected.
- The router is network-locked or asks for an unlock code.
- The dashboard shows account, registration or activation errors.
- A reset does not restore the router or admin login details are unknown.
What Not to Do
DataCost is not the provider. Do not share OTPs, banking passwords, card details, PINs or personal identity documents with unofficial support channels.
- Do not factory-reset the router before noting the Wi-Fi name, admin login and APN profile.
- Do not share router admin passwords, OTPs or account details with unofficial support channels.
- Do not force SIM adapters or damaged SIM cards into the slot.
Related DataCost Guides
Related Fix Pages
FAQs
Should I reset my router first?
A power restart is safer as a first step. Factory reset only when you have the router login details and know how to restore APN and Wi-Fi settings.
Who should I contact if the router still fails?
Contact the mobile network for SIM, plan and APN issues, or the router seller/manufacturer for hardware and warranty issues.
Official Support Reminder
This is a general troubleshooting guide for South African consumers. Always confirm billing, payment, activation, meter, token, subscription and account-specific issues with the official provider.
Author and review notes
Written by Riccardo Vallaro
Telecom & Mobile Services Specialist
Mobile services and telecom professional with experience across VAS, carrier billing, mobile content, and African operator partnerships.
Reviewed / updated: 20 May 2026
Why trust this guide: Written as independent consumer help for South African mobile, electricity, decoder and router problems. Provider-specific account actions should be confirmed through official support.
Found something outdated? Send a correction.