# G203 > Callny G203 gate controller: how to add authorised phone numbers, what its SMS commands do, and how to open the gate from your phone with the GateOpener app. Canonical: https://gate-opener.app/hardware/callny-g203/ Verified by Callny / Daniu GSM / LPSECURITY Also known as: G203, CN G203 | | | | --- | --- | | Manufacturer | Callny / Daniu GSM / LPSECURITY | | Protocol | Callny | | Default password | 1234 | | Max users | 999 | | Relays | 1 | | Power supply | DC 9-36V | | SIM type | Nano SIM | | Relay rating | 3A / 240VAC | | Operating temp | -10 to +60 C | | Dimensions | 96.5 x 50 x 31.5 mm | ## At a glance The Callny G203 is the Callny G202 PLUS with a third tier of users. Same SMS protocol, same default password (1234), same 999-user capacity and one relay, plus call-only normal users, push alerts on relay actions and a relay delay of up to 9999 seconds. Last reviewed: May 23, 2026 ## What the G203 is The Callny G203 is the sibling of the G202 PLUS. It is built on the same hardware platform and accepts the same Callny SMS command set, plus commands for normal users (NORTEL, NORPWD) and push notification users (PUSH, DELPUSH, PUSHALL). Like the G202 PLUS, it is sold under multiple brand names — Callny, Daniu, LPSECURITY — but the firmware and command syntax are identical across rebrands. The default password is 1234; normal users use 0000. ## How it works Same as the G202 PLUS, with a third tier of users. A normal user, added with {pwd}#NORTEL{phone}#DEF#, can call to open the gate but cannot manage users. Up to 3 push users, added with {pwd}#PUSH{phone}#, get an SMS when the relay switches. The relay is a dry contact, wired to the push-button input of your gate motor or barrier controller like the G202 PLUS. ## What's in the box - Callny G203 main unit - GSM/4G antenna - DC power pigtail - Multilingual quick guide PDF ## Quickstart setup A 15-minute walkthrough to get the G203 from boxed to working. For the full guide with example SMS responses and error handling, see the [G203 setup guide](https://gate-opener.app/blog/callny-g202-setup-guide/). 1. **Insert a SIM.** Same prerequisites as the G202 PLUS — voice + SMS plan, PIN disabled. 2. **Power up.** 9-36V DC, antenna connected outside any metal enclosure. 3. **Add yourself as super admin.** Send 1234#TEL{phone}#DEF#. 4. **Change the password 1234.** Send 1234#PWD{new-password}#PWD{new-password}#. 5. **Add a call-only user.** Send {pwd}#NORTEL{phone}#DEF#. 6. **Test.** Call the SIM from each authorized number and confirm the relay clicks. GateOpener translates all these commands into a clean interface. Add users, change settings and open your gate without remembering a single code. [Download GateOpener](https://gate-opener.app/download/) ## Common issues and fixes A normal user cannot add other users That is by design: normal users (NORTEL) can only call to open. Add the number with {pwd}#TEL{phone}#DEF# instead if it should manage users. NORTEL or PUSH returns an error Normal users, NORPWD and the PUSH commands exist only on the G203. On a G202 PLUS, add every user with {pwd}#TEL{phone}#DEF#. Hitting a problem not listed here? The [full troubleshooting guide](https://gate-opener.app/blog/rtu5024-troubleshooting/) covers the seven most common failure modes in detail. ## Frequently asked questions ### What is the default password for the G203? The default password for the G203 is 1234. Change it immediately after first setup using an SMS command. GateOpener can change it for you with a single tap. ### How many authorized phone numbers can the G203 store? The G203 supports up to 999 authorized phone numbers across 1 relay output. Each authorized number can open the gate by calling the module — no SMS or charge required. ### Does the G203 need a SIM card? Yes. The G203 requires an active Nano SIM SIM card with voice and SMS capability. A data plan is not required. Remove the SIM PIN before inserting. ### What manufacturers sell the G203? The G203 is manufactured and rebranded by several companies: Callny / Daniu GSM / LPSECURITY. The hardware and SMS command set is identical across rebrands. ### Can I use the G203 with the GateOpener app? Yes. GateOpener fully supports the G203 — replace SMS commands with buttons, manage users from a clean interface, see activity logs, and add temporary access codes for guests. ## Buying tips - Only choose the G203 over the G202 PLUS if you need call-only normal users or push alerts. Otherwise the G202 PLUS does the same job and is slightly cheaper. - Confirm the seller is shipping the PLUS-equivalent G203 (newer hardware) rather than an early non-PLUS revision. ## Also sold as Callny G203, Daniu G203, LPSECURITY G203. The G202 PLUS with normal users and push alerts. ## More G203 resources - [Full SMS command reference for the G203](https://gate-opener.app/hardware/callny-g203/commands/) - [G203 user manual page (with PDF download)](https://gate-opener.app/manuals/callny-g203/) - [Step-by-step setup walkthrough](https://gate-opener.app/blog/callny-g202-setup-guide/) - [Callny SMS commands explained](https://gate-opener.app/blog/callny-g202-sms-commands-explained/) - [Best GSM gate opener modules in 2026 — compared](https://gate-opener.app/blog/best-gsm-gate-opener-2026/) ## Most used commands [View all →](https://gate-opener.app/hardware/callny-g203/commands/) ### Add admin user (auto-assign slot) Add admin user with auto-assigned slot ID Syntax: `{pwd}#TEL{phone}#DEF#` Example: `1234#TEL+31612345678#DEF#` ### Add admin user (specific slot) Add admin user with specific slot ID (001-999) Syntax: `{pwd}#TEL{phone}#{userID}#` Example: `1234#TEL+31612345678#001#` ### Add normal user (auto-assign, G203 only) Add normal user (can only call to open, cannot manage users) Syntax: `{pwd}#NORTEL{phone}#DEF#` Example: `1234#NORTEL+31612345678#DEF#` ### Add normal user (specific slot, G203 only) Add normal user with specific slot ID Syntax: `{pwd}#NORTEL{phone}#{userID}#` Example: `1234#NORTEL+31612345678#005#` ### Delete user by slot Remove user by slot ID. Super admin cannot be deleted. Syntax: `{pwd}#TEL#{userID}#` Example: `1234#TEL#002#` ## Skip the SMS commands GateOpener translates all these commands into a clean interface. Add users, change settings and open your gate without remembering a single code. [Download GateOpener](https://gate-opener.app/download/) ## Related modules (Callny) [![G202 PLUS](https://gate-opener.app/images/hardware/callny-g202-front-transparent.png) G202 PLUS Callny / Daniu GSM / LPSECURITY](https://gate-opener.app/hardware/callny-g202/) ## Related - [G203 SMS Commands](https://gate-opener.app/hardware/callny-g203/commands/) - [Download PDF Manual](https://gate-opener.app/manuals/G202_PLUS_G203_quick_guide_V2.1.pdf)