Which SIM does the Wafer GSM-HOUSE take?
A standard size SIM (2FF), voice-capable, PIN lock removed. The GSM-HOUSE is the budget end of the market — a 2G intercom with a 200-number whitelist and battery backup — and it's fussier than premium kit about SIM basics, so get them right: active SIM, credit present, SMS centre number stored.
Which network?
2G hardware, so it needs live 2G at the door. With budget units on fading networks, the network choice matters most of all: check which of Vodafone, O2 and EE still carries usable service at the property, and order on that one rather than whichever SIM is nearest.
Fitting the SIM
For the installing engineer, power off (and disconnect the backup battery so it's genuinely off):
- Fit the standard SIM in the board holder.
- Antenna connected before power.
- Reconnect battery, then mains.
First power-up
Let it register, program the whitelist and call numbers by SMS per the manual — international format for every number — and test call-in and dial-to-open both.
If it won't connect
- No registration: 2G at the door? Old-phone test.
- Commands ignored: SMS centre number on the SIM; exact syntax — budget firmware forgives nothing.
- Random reboots: power supply and battery health before blaming the board.
FAQ
How many users? 200 whitelist numbers.
What's the battery for? Riding out mains cuts — the intercom keeps working on backup.
Long-term outlook? 2G-limited. Serviceable where 2G holds; budget 4G units are the natural replacement.
Keep your Wafer GSM-HOUSE Intercom online.
Choose Vodafone, O2 or EE — or let our free Signal Intelligence check pick the strongest one at your address. No contracts, built for intercoms and gate systems.
Get your SIMFull Wafer GSM-HOUSE Intercom manual
For wiring diagrams, programming syntax and full commissioning notes, download the manufacturer's manual we host.
Open the GSM-HOUSE Intercom manual page