Use this article if…
- MK4 is “connected” but has no usable internet, APN, SIM tray, captive portal - not Bluetooth pairing.
- Projection won’t start → Phone pairing. iPhone network hopping during CarPlay → CarPlay vs Wi‑Fi.
Quick answer
Wi‑Fi that shows connected but loads nothing is frequently a captive portal, wrong MVNO APN, or a SIM tray that is not making contact - open the MK4 browser to finish camp logins, re-seat the SIM power-off, and paste APN details exactly as the carrier publishes.
Problem
- The MK4 has no usable internet over Wi-Fi, SIM, or hotspot.
Symptoms
- Wi-Fi shows connected but there is no usable data.
- SIM does not register or drops when moving.
- Camp or venue Wi-Fi never reaches the internet (captive portal stuck).
Cause
- APN or carrier settings on the SIM path can be wrong for your MVNO.
- Inline fuses, SIM tray contact, or local router/security policies block traffic.
Fix Step-by-step
- Try Wi-Fi, built-in SIM, or phone hotspot - know which path you use.
- Power off before re-seating SIM.
- Enter MVNO APN exactly as the carrier publishes.
- Open browser on MK4; complete captive portal if shown.
- Download offline map regions when you do have a link.
Notes
- First boot Wi-Fi: First-time setup
- Phone: Pairing
- Wireless CP/AA: Wireless guide
- Maps stall in CarPlay: iPhone Wi‑Fi routing
- Unit reboots: Power troubleshooting