MR1100 suddenly cannot connect to cell service

Sorry to hear you're dealing with this — frustrating for sure, especially after trying so many solid troubleshooting steps already. Based on your detailed notes, here’s a breakdown of possibilities and next steps to try for your Netgear Nighthawk MR1100 (on AT&T/Consumer Cellular):

🔍 Let’s review what might be going wrong:

1. SIM/Account Issue
   Even though the SIM is new and provisioned, sometimes APN settings or account provisioning (especially on MVNOs like Consumer Cellular) can cause data connection failures. Adobe customer support
2. Signal/Modem Hardware Problem
   Since you're getting 3 bars, it's not a total dead zone — but weak signal can sometimes cause unreliable data connection handshakes. Still, it shouldn't cause total failure unless the modem is failing.
3. Firmware or Device Failure
   Since it worked for a year and then stopped suddenly, firmware corruption or hardware (e.g., modem or radio module) failure is possible.

✅ Suggestions / What to try next:

1. Check and Set APN Manually

Sometimes the default APN settings don’t get updated correctly when switching SIMs, especially on MVNOs like Consumer Cellular.

• Go to http://attwifimanager/ while connected to the MR1100 Wi-Fi
• Navigate to Settings > Network Settings > APN
• Create a New APN manually:

For Consumer Cellular (AT&T), try:

makefile

CopyEdit

APN: att.mvno

Username: (leave blank)

Password: (leave blank)

Authentication: None

• Set it as default, save, and reboot.

1. Check SIM Status and Modem Info

• On attwifimanager, go to About > Modem Status
• Does it show the IMEI and ICCID correctly?
• What is the Network Status? Does it say "Registered", "Searching", "Disconnected", etc.?