Cell Box Switch SIM installation guide

Which SIM does the BFT Cell Box Switch take?

A standard size SIM (2FF), voice-capable, PIN-free. The Cell Box Switch is the dialler/switch variant of BFT's cellular family — dial-to-open triggering and SMS alerts rather than full intercom calling — so it needs minimal credit but the SIM must stay active on the network.

Which network?

2G hardware: it needs live 2G at the gate. A multi-network SIM keeps it on whichever compatible network survives strongest — for a device whose entire job is being reachable, that's the spec that matters.

Fitting the SIM

For the installing engineer, power off:

1. Fit the standard SIM in the board holder.
2. Antenna on before power, outside any metal enclosure.
3. Wire the output to the operator's trigger input; confirm pulse or latch.

First power-up

Let it register, program the authorised numbers by SMS in full international format, and test: call from an authorised phone, ring-off, relay click, gate moves.

If it won't trigger

• Rings, no relay: number format on the authorised list — international, always.
• Unreachable: 2G coverage at the gate; antenna placement.
• Relay fires, gate ignores: operator wiring or pulse/latch mismatch.

FAQ

Does calling it cost anything? No — it rejects the call before answering.

What are the SMS alerts for? Status and alarm signalling to stored numbers — that side does use SMS credit.

2G future? Tied to your area's switch-off. For new supply, fit a 4G dial-to-open unit instead.