Hello,
Thank you for reaching out.
First, could you please clarify which specific bands you’ve locked the router to? I assume you’ve selected the bands that are most reliable and stable based on your area’s coverage, right?
Additionally, it’s important to mention that modern smartphones often support higher LTE and 5G modem categories with more advanced carrier aggregation (CA) combinations than most industrial-grade routers, including Teltonika-Networks devices. Smartphones and consumer routers like the Xiaomi model you mentioned are typically equipped with higher-category modems capable of aggregating multiple frequency bands simultaneously, which has a significant impact on achievable speeds.
I’d also recommend having a look at a similar discussion shared in our forum here:
where you might find some valuable insights and practical adjustments in relevant situations.
Best regards,