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Universal (RM551E & RM520N)

Custom SIM Profiles & Switching

Save complete snapshots (APN + TTL + custom bands) tied to physical SIM cards for instant auto-provisioning.

4 min read · Updated

Custom SIM Profiles & Switching

If you swap SIM cards between multiple providers (e.g. switching between a primary unlimited plan and a backup rural carrier), configuring APN, TTL, and band locks manually each time is tedious and error-prone.

QManager RM551E Custom SIM profiles screen
RM551E: Bundle APN, IMEI and TTL settings into profiles and see which one is in force today.

What is a Custom SIM Profile?#

A Custom SIM Profile is a complete, self-contained configuration snapshot saved in QManager's persistent registry.

Attributes Saved in Each Profile#

Each profile stores:

  • APN Credentials: APN name, CID, authentication protocol.
  • Network Mangling: IPv4 TTL, IPv6 Hop Limit, MTU.
  • Radio Policies: Locked LTE/5G bands, network priority mode (NSA vs SA).
  • Optional IMEI: Hardware identity tied to that specific carrier plan.

Automatic Switching on Physical SIM Swap#

When you swap SIM cards, QManager reads the new card's ICCID (Integrated Circuit Card ID) via AT+QCCID:

  1. Checks the Known SIMs database.
  2. Identifies the matching profile.
  3. Automatically applies the appropriate APN, TTL, and band rules in under 5 seconds!

Screens in QManager#

QManager RM551E IMEI settings screen
RM551E: View and change the modem IMEI, with a backup IMEI and built-in checks.
QManager RM520N IMEI settings screen
RM520N: IMEI Settings reads, checks, and writes the modem's IMEI, with a backup copy.
QManager RM520N Custom SIM profiles screen
RM520N: Custom SIM Profiles bundle APN, TTL, and a connection scenario, with a daily schedule.