# Teltonika RUTM50 SIM Card Setup > Set up a ThingSIM data SIM in a Teltonika RUTM50: which SIM size and plan, inserting the SIM, the RutOS APN and roaming settings, SIM failover and troubleshooting. Device setup · Published 3 November 2026 The Teltonika RUTM50 is a dual-SIM 5G industrial router with gigabit Ethernet and Wi-Fi, Teltonika's replacement for the RUTX50. It takes a mini SIM, and a ThingSIM connects on whichever of O2, Vodafone, Three and EE is strongest once the APN is set in RutOS. *Specifications and menu paths checked against Teltonika's own documentation on 3 November 2026; sources are listed at the end. Menus can move between firmware versions, so if yours differs, follow the manual for your version.* ## What the RUTM50 Is A 5G router with two SIM slots, gigabit Ethernet and dual-band Wi-Fi. It is a current model. ## Which ThingSIM Suits the RUTM50 **Compatible.** It supports 5G SA and NSA and LTE Cat 19, with no 2G. Teltonika lists LTE bands 1, 3, 5, 7, 8, 20, 28, 32 and 71, plus 38, 40, 41, 42 and 43 for the versions sold in Europe, which cover the 4G bands used by all four UK networks. The RUTM50 has two mini SIM (2FF) slots, so order a **physical ThingSIM** and use the mini size. Teltonika does not list an eSIM for it. ThingSIM plans use 4G, so a 5G router connects on 4G. As a main connection for a small site or cameras, start on **UK 4-network 5 GB** at £8.85 a month; as failover only, 1 GB at £2.40 is often enough. ## Insert the SIM 1. Activate the SIM in the ThingSIM portal when you are ready to test; billing starts that day. 2. With the power disconnected, push the SIM holder button with the SIM needle and pull the holder out. 3. Place the mini SIM in the holder as the drawing in Teltonika's quick start guide shows, slide it back in, and fit the antennas. 4. Connect the power. On sites with heavy vibration, Teltonika suggests a thin layer of dielectric grease on the SIM contacts. ## Set Up Mobile Data in RutOS 1. Log in to the WebUI at http://192.168.1.1 (user admin, password on the label) and go to **Network → Mobile → General**. 2. In **Interface mob1s1a1 APN configuration** (SIM 1), switch **Auto APN** off. In the **APN** field, enter the APN shown in your ThingSIM portal when you activate the SIM. 3. Set **Authentication type** to None and leave the username and password blank. 4. In **SIM configuration**, leave **Deny data roaming** off. A ThingSIM always connects to UK networks as a roaming SIM. 5. Leave the **PIN** field empty unless the SIM has a PIN, then click **Save & Apply**. ## Two SIMs and Failover Two-SIM models use one SIM at a time. Rules are set on the **SIM Switch** tab of **Network → Mobile**, with conditions such as weak signal, no network, network denied, data connection failure and data limit. **Do not enable the On roaming condition for a ThingSIM**: it would switch away from the SIM every time it connects, because a ThingSIM always roams. One UK 4-network ThingSIM already uses O2, Vodafone, Three and EE, so a second SIM mainly helps where a different provider or a private APN is wanted. Each active SIM is billed separately. ## Check It Is Working **Status → Network → Mobile** shows the SIM card state, operator, network type, connected band, signal quality (RSSI, RSRP, RSRQ, SINR) and the data connection state, with buttons to restart the connection or switch SIM slot. Teltonika RMS shows the same remotely, and the ThingSIM portal shows the SIM's usage. ## Troubleshooting - **Operator shows but data does not connect:** check **Deny data roaming** is off and Auto APN is off with the portal's APN entered on the interface for the slot the SIM is actually in. - **SIM not detected:** power off, reseat the SIM in the holder the way the quick start drawing shows, and check it is the mini size. - **Signal but no data:** check the SIM is activated in the ThingSIM portal, the APN matches the one shown in the portal exactly with no spaces, and data roaming is allowed. Then work through [signal but no data](/sim-signal-but-no-data) in order. - **It worked, then stopped:** look at the SIM's usage in the portal. A ThingSIM pauses when it reaches its monthly allowance; upgrade the plan straight away or wait for the reset. ## Common Questions ### Does a ThingSIM work in a Teltonika RUTM50? Yes. The RUTM50's LTE bands cover all four UK networks. Put the SIM in, switch Auto APN off and enter the APN shown in your ThingSIM portal, and leave Deny data roaming off. ### What size SIM does the RUTM50 take? A mini SIM (2FF), the largest size on the ThingSIM trio card. ### Will a ThingSIM use 5G in this router? No. ThingSIM plans use 4G, so the router connects on 4G LTE, which is plenty for failover, telemetry and most cameras. ## Related Guides - [Setting up a 4G router with a data SIM](/setting-up-a-4g-router) - [Port forwarding on a 4G router](/port-forwarding-4g-router) - [Teltonika routers and gateways](/devices/teltonika) - [APN settings: how to set up the APN on a device](/apn-settings) - [How much data does my device need?](/how-much-data-does-my-device-need) - [The best IoT and M2M SIM cards in the UK](/best-iot-sim-card-uk) - [The UK 4-network 5 GB plan](/plans/uk-4-network-5gb) - [Compare every ThingSIM plan](/plans) ## Sources Checked on 3 November 2026. - Teltonika RUTM50 product page, specifications and versions: [www.teltonika-networks.com/products/routers/rutm50](https://www.teltonika-networks.com/products/routers/rutm50) - Teltonika wiki: RUTM50 Mobile: [wiki.teltonika-networks.com/view/RUTM50_Mobile](https://wiki.teltonika-networks.com/view/RUTM50_Mobile) - Teltonika wiki: RUTM50 Network status: [wiki.teltonika-networks.com/view/RUTM50_Network](https://wiki.teltonika-networks.com/view/RUTM50_Network) - Teltonika wiki: RUT241 quick start guide (SIM holder steps): [wiki.teltonika-networks.com/view/QSG_RUT241](https://wiki.teltonika-networks.com/view/QSG_RUT241) ## Recommended plan 5 GB, UK 4-network: £8.85 a month per active SIM, ex VAT. Source: https://thingsim.com/teltonika-rutm50-sim-setup