# Blog > All 21 GateOpener guides, newest first: setup, SMS commands, troubleshooting, SIM cards, the 2G shutdown and module comparisons for GSM gate openers such as the RTU5024 and Callny G202. Canonical: https://gate-opener.app/blog/ Setup guides, troubleshooting tips, and comparisons for GSM gate opener modules. - [Open Your Gate With Your Phone: GSM Relay Setup in 7 Steps](https://gate-opener.app/blog/open-gate-with-phone-gsm-relay/) - Seven steps to open a gate with your phone: find the push-button input, pick a GSM relay, prepare the SIM, wire it, add your number, lock it down, call to open. - [How to Add a Phone Number to Your RTU5024 (Step-by-Step)](https://gate-opener.app/blog/how-to-add-phone-number-rtu5024/) - Step-by-step guide to add a new authorized phone number to your RTU5024 GSM gate opener: exact SMS syntax, slot numbering, confirmation reply, and how to fix Password Error and no-reply failures. - [RTU5024 Default Password: What It Is, How to Change It, How to Reset It](https://gate-opener.app/blog/rtu5024-default-password/) - RTU5024 default password is 1234. How to change it, how to factory-reset if forgotten, and why you must change it before adding authorized users. Exact SMS commands included. - [Callny G202 PLUS vs RTU5024: Which GSM Gate Opener Should You Buy?](https://gate-opener.app/blog/g202-vs-rtu5024/) - Callny G202 PLUS vs RTU5024: side-by-side on price, SMS protocol, default password, features, and use cases. Pick the right GSM gate opener in five minutes. - [2G Shutdown Dates by Country: Which Networks Still Run 2G and What It Means for Your Gate Opener](https://gate-opener.app/blog/2g-shutdown-dates-by-country/) - Confirmed 2G shutdown dates for 14 countries — UK, Netherlands, Germany, France, Spain, Italy, Australia, and more. When your GSM gate opener will stop working and what to upgrade to. - [Airbnb Gate Access: How to Grant Guests Temporary Gate Codes Without Sharing Your Own](https://gate-opener.app/blog/airbnb-gate-access/) - Four ways to give Airbnb guests temporary gate access without sharing your master code: dedicated SMS, time-limited authorized numbers, smart lock combo, and the GateOpener app. - [Property Manager Gate Access: Manage Tenants, Cleaners, and Contractors Without the Mess](https://gate-opener.app/blog/property-manager-gate-access/) - Manage gate access across rotating tenants, cleaners, and contractors. Compare physical fobs, shared SMS codes, and per-gate access lists with full audit trails. - [Gate Opener App vs Smart Gate Systems: 2026 Cost Guide](https://gate-opener.app/blog/gate-opener-app-vs-smart-gate-systems/) - 8 gate opener systems compared: GateOpener (EUR 40) vs Remootio (~EUR 130), Palgate, CAME, Nice, BFT, FAAC. 3-year cost, subscriptions, and privacy reviewed. - [Remootio vs GateOpener: Which Gate System Is Worth It?](https://gate-opener.app/blog/remootio-vs-gateopener/) - Remootio 3 (~EUR 130, WiFi) vs GateOpener (EUR 40, cellular): 16-point feature comparison, first-year cost breakdown, privacy, and which fits your setup. - [Future-Proof Your Gate Opener for 4G: 2G Shutdown Guide](https://gate-opener.app/blog/future-proof-gate-opener-4g/) - How to check if your gate opener module is really 4G, spot fake modules, upgrade to genuine 4G hardware, and why GateOpener works with both 2G and 4G. - [The 2G Shutdown Is Here: What It Means for Your Gate Opener](https://gate-opener.app/blog/2g-shutdown-gsm-gate-opener/) - 2G shutdown timeline by country, how to spot fake 4G gate opener modules, and upgrading to genuine 4G. Covers Europe, US, and Asia with carrier-specific dates. - [Callny G202 SMS Commands: The Complete Reference](https://gate-opener.app/blog/callny-g202-sms-commands-explained/) - Callny G202 SMS command reference with 30+ commands: passwords, 3 user roles, relay control, KPON mode, GOT timing, and signal diagnostics. - [How to Set Up Your RTU5024 GSM Gate Opener](https://gate-opener.app/blog/rtu5024-setup-guide/) - Complete RTU5024 setup guide: SIM card prep, relay wiring, password change, adding users, and testing. Covers all RTU5024 variants with step-by-step SMS commands. - [RTU5024 SMS Commands: The Complete Reference](https://gate-opener.app/blog/rtu5024-sms-commands-explained/) - Complete RTU5024 SMS command reference: password, users, relay, GOT timing, notifications, signal. Every command with syntax, examples, and responses. - [Which SIM Card Works Best for GSM Gate Openers?](https://gate-opener.app/blog/best-sim-card-gsm-gate-opener/) - SIM card guide for GSM gate openers: 4 SIM sizes compared, prepaid vs contract, PIN removal, 2G shutdown dates for 10+ countries, and carrier picks for UK, NL, DE, US, FR. - [RTU5024 Troubleshooting: Fix These 7 Common Problems](https://gate-opener.app/blog/rtu5024-troubleshooting/) - Fix 7 common RTU5024 problems: no network, Error password, no SMS response, users locked out, gate timing, missing notifications, module stopped working. - [Best GSM Gate Opener Modules in 2026: Complete Comparison](https://gate-opener.app/blog/best-gsm-gate-opener-2026/) - RTU5024 vs Callny G202 compared on 7 features: user capacity (999 vs 999), relays, access control, SIM type, 4G, and price. Which GSM gate opener is best? - [How Does a GSM Gate Opener Work? A Simple Explanation](https://gate-opener.app/blog/how-gsm-gate-opener-works/) - How GSM gate openers work: signal path, SMS commands, GSM vs WiFi vs Bluetooth, key components, and use cases. From phone call to open gate in under 2 seconds. - [RTU5024 4G vs 2G: Do You Need the LTE Version?](https://gate-opener.app/blog/rtu5024-4g-vs-2g/) - RTU5024 4G vs 2G compared: identical SMS commands, different modem. 2G shutdown timelines for 10+ countries, when to buy 4G, and step-by-step migration. - [Callny G202 PLUS Setup Guide: SMS Commands and Configuration](https://gate-opener.app/blog/callny-g202-setup-guide/) - Callny G202 PLUS setup guide: nano SIM card, alphanumeric passwords, auto-assign user slots, 3 user roles (G203), relay timing. Covers key differences from RTU5024. - [Temporary Gate Access: Guide for Guests and Deliveries](https://gate-opener.app/blog/temporary-gate-access-guide/) - 4 ways to manage temporary gate access on RTU5024 and Callny G202: manual add/remove, auto-expiring, count-limited passes, and weekly schedules. Best method for Airbnb, deliveries.