Teltonika Calyx EBD021 — SIM Pack | SIMSY Shop
Teltonika Calyx EBD021 Pi Hat
4G · Pi 4 / Pi 5
SIM pack
Tested with SIMSY

Teltonika Calyx EBD021

The EBD021 is the 4G Cat 4 entry in Teltonika's Calyx family — a cellular HAT+ that snaps onto a Raspberry Pi 4 or Pi 5's GPIO and adds a managed mobile connection. Compact, fanless, GPIO-controllable (wake / reset / power), with PCM audio for voice applications. Pairs with the SIMSY API and the Cellular Private LAN tooling out of the box.

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£49ex VAT
+£9.80 UK VAT · £58.80 inc VAT
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Key features

  • 4G LTE Cat 4 modem — up to 150 Mbps DL / 50 Mbps UL
  • Raspberry Pi HAT+ form factor — sits on top of a Pi 4 or Pi 5 GPIO header
  • Network presented as eth0 to the Pi (RNDIS / ECM) — no special drivers
  • GPIO modem control — wake, reset and power-cycle from the Pi
  • PCM audio interface for voice / VoLTE applications
  • Compact, fanless industrial design

Technical specifications

Cellular

RAT
4G LTE Cat 4
Throughput
Up to 150 Mbps DL / 50 Mbps UL
Fallback
3G + 2G
SIM slot
1× Nano-SIM (4FF)
Antennas
2× SMA (main + diversity)

Host integration

Form factor
Raspberry Pi HAT+ (40-pin GPIO)
Compatible boards
Raspberry Pi 4 + Pi 5
Host interface
USB (presented as RNDIS / ECM eth0)
Modem control
GPIO — wake / reset / power
Audio
PCM (voice / VoLTE)

Power

Input
5 V DC via Pi GPIO
Cooling
Fanless

Compliance

Certifications
CE, UKCA (verify region before deployment)
Warranty
24 months manufacturer

What's in the box

  • EBD021 Calyx HAT+ board
  • GPIO standoffs and screws
  • 2× LTE antennas
  • Quick start guide

Best for

Cellular for an existing Pi-based product

You already ship a Pi 4 / Pi 5 inside a product. Add cellular without redesigning the enclosure — the HAT slots onto the GPIO and the Pi sees a standard Ethernet interface.

Lightweight remote IoT nodes

Sensors, gateways, kiosks where 4G is the right primary connection. The Pi handles application logic; the EBD021 handles the network.

Cellular as fallback for fixed-line Pis

Pi is normally on Wi-Fi or Ethernet, but you need a fallback for the moments when those drop. The EBD021 becomes the backup interface, controlled from the application layer.

Frequently asked

Do I need a separate Raspberry Pi?
Yes — the EBD021 is a HAT, not a standalone device. It mounts on the 40-pin GPIO of a Pi 4 or Pi 5, which provides the power, application logic and Ethernet/Wi-Fi connectivity.
How does the Pi see the modem?
Once you plug the HAT in, the Pi gets an additional Ethernet interface (typically eth1 or similar) via RNDIS / ECM USB-Ethernet emulation. No proprietary drivers — works with stock Raspberry Pi OS, Ubuntu, anything Linux-y.
Is it eSIM-compatible?
No — physical Nano-SIM (4FF) only. Pair with a physical SIMSY SIM. If you want eSIM, look at the EBD050 (5G) or EBD070 (5G RedCap) variants.
Does it ship with a SIM?
No — hardware only. Pair with the Developer Starter (2 SIMs) for the smallest practical setup.
What's the warranty?
24 months manufacturer warranty from Teltonika. We handle returns and exchanges through the SIMSY shop.

Ships from the UK

Most orders dispatched same day or next working day via Royal Mail.

GB delivery

Mainland UK addresses only for v1. Get in touch for international.

14-day returns

Change your mind? See the returns policy.

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