Use this article if…
- Your MK4 shows “connected” but has no usable internet: APN, SIM tray, captive portal, not Bluetooth pairing.
- Projection won’t start → Phone pairing. If your iPhone hops networks during CarPlay → CarPlay vs Wi-Fi.
Quick answer
If your MK4 shows connected on Wi-Fi but nothing loads, it's usually a captive portal, the wrong MVNO APN or a SIM tray that isn't making contact. Open the MK4 browser to finish camp logins, power off before you re-seat the SIM, and enter the APN details exactly as your carrier publishes them.
Problem
- Your MK4 has no usable internet over Wi-Fi, SIM or hotspot.
Symptoms
- Wi-Fi shows connected but you get no usable data.
- The SIM doesn't register, or it drops when you're moving.
- Camp or venue Wi-Fi never reaches the internet, so the captive portal stays stuck.
Cause
- If you're on an MVNO, your APN or carrier settings on the SIM path can be wrong.
- You can also be blocked by inline fuses, SIM tray contact or local router and security policies.
Fix Step-by-step
- Work out which path you're using: Wi-Fi, the built-in SIM or a phone hotspot.
- Power off the unit before you re-seat the SIM.
- Enter the MVNO APN exactly as your carrier publishes it.
- Open the browser on the MK4, then complete the captive portal if one shows.
- Download offline map regions while you've got a connection.
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