Our FlexiFone Voice/SMS Multi-Network SIMs are designed primarily for use in smartphones and tablets. Unfortunately, they cannot be used in WiFi routers, portable MiFi devices, or other tethering equipment due to restrictions from our roaming partners.
🚫 Why Voice/SMS Plans Don’t Work on Routers or MiFi Devices
Mobile networks can identify the type of device being used through its IMEI number. When the SIM is inserted into a router or MiFi device, the network recognises it as a tethering device rather than a phone or tablet.
Because tethering devices add extra load to the mobile network, roaming partners block them from using Voice/SMS SIMs. This restriction is not unique to FlexiFone — it applies to most multi-network roaming SIMs in the UK.
✅ The Best Alternative: FlexiFone Data-Only Plans
If you want to use your SIM in a WiFi router or portable hotspot (MiFi), we recommend choosing a FlexiFone Data-Only Plan. While these plans are slightly more expensive than Voice/SMS options, they are:
💯 100% compatible with routers, dongles, and portable MiFi devices
🌍 Designed for high data usage and sharing across multiple devices
📶 Optimised for multi-network roaming, giving you the best possible coverage
📌 Summary
Voice/SMS plans → Work only on smartphones and tablets (not routers or MiFi devices)
Data-only plans → Fully supported on WiFi routers, MiFi devices, and tethering setups
So if your goal is to power a home router, office backup connection, or a portable WiFi hotspot for travel, a FlexiFone Data-Only SIM is the perfect solution.