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We've been running these 8818S units for about 18 months now – they take a standard PSTN phone and turn it into a cellular line through 3G or GSM, which is basically what it does for PBX systems. The sensitivity is typically below -104dBm, so signal handling is solid even in weaker areas, and transmitting power sits under 3W which keeps interference low.
Most of our clients use them as backup lines for VoIP gateways or to add a mobile circuit to legacy PBX extensions, especially in remote sites where landlines are unreliable. Teh RJ-11 port handles caller ID and SMS pretty well, though the SMS feature is more of a secondary function – nobody's using it for bulk texting.
It's not ideal for high-volume call centers since the talk time is only about 2.5 hours on the backup battery (7.2V 1300mAh Li-ion), but for emergency failover or a single extension it's perfectly fine. Actually, one buyer we had tried using it for a security alarm panel – worked fine on the line side but the 45V hanging voltage needs checking against panel's requrement.
Order volumes vary a lot – we'll ship 50 units or so for a telco rollout, then just 2-3 for a small office setup. Lead time is usually around 20 days from order, but we recommend confirming stock because the Quectel module inside can be allocated elsewhere depending on demand (we saw delays once in Q3 last year).
Anyway, the antenna gain is >2.5db which is better than most consumer-grade terminals we've used, and the operating temp range from -10°C to 60°C covers outdoor enclosures fine – just don't leave it in direct sun in summer. Longest we've seen a unit run without issues is roughly 8 months in a dusty warehouse environment, so build quality is decent for industrial use.
Prices shift a bit base on quantity – MOQ is usually 10 pieces for a decent rate, but our company can do single units for evaluation. The COA covers network band tests and output voltage, though we don't test every SIM slot configuration unless requested (usually just the 1.8V/3V compatiblity).
It supports both. It's a dual-mode terminal that works on GSM (2G) and WCDMA (3G) networks, so it'll fall back to 2G if 3G signal is weak.
We typically require a MOQ of 50 units for the 8818S, but we can be flexible for first-time buyers or trial orders—just reach out to our sales team.
Yes, each unit comes with CE and RoHS compliance certificates. We can also provide a full test report on request, including sensitivity and power output data.
Any standard analog phone with an RJ-11 connector works—no special handset needed. Just plug it in, insert a SIM, and you're good to go.
The backup battery is optional and sold separately. With it, standby time is about 24 hours, and talk time is around 2.5 hours. Without it, the unit runs only on AC power.
