u-blox SARA-R510M8S in Bulgaria
⚠ The bands of this country’s networks come mostly from a single source (the Wikipedia list of LTE networks in Europe) for now, so treat these verdicts as provisional while we add second sources. Confirm with the operator before you deploy.
The u-blox SARA-R510M8S rates good on 1 of 3 networks in Bulgaria (A1). On Yettel it is unconfirmed, missing a coverage band. On Vivacom it is unconfirmed, missing a coverage band.
Network by network
| Network | Verdict | Bands in use it supports | Core bands missing |
|---|---|---|---|
| A1 | ✔ Good 86% | B1 B3 B8 B20 | — |
| Yettel | ? To be confirmed 80% | B1 B3 B20 | — |
| Vivacom | ? To be confirmed 89% | B1 B3 B8 B20 B28 | — |
Better-rated models here
- Huawei E5576-320 MiFi · Cat 4 · Pocket Wi-Fi · Europe, Asia and Africa version · Huawei · 3/3 Good
- Huawei E5577-320 MiFi · Cat 4 · Pocket Wi-Fi with display · Europe, Asia and Middle East version · Huawei · 3/3 Good
- Quectel RM520N-GL 5G Sub-6 · global · Quectel · 3/3 Good
About the u-blox SARA-R510M8S
LTE-M / NB-IoT · global · u-blox12
- 4G B1 B2 B3 B4 B5 B8 B12 B13 B18 B19 B20 B25 B26 B28 B66 B71 B85
- LTE-M and NB-IoT assessed together
LTE-M and NB-IoT are assessed together: B25 is LTE-M only, B66, B71 and B85 are NB-IoT only, and the “00” versions do not support NB-IoT.
Network access: long-term roaming
Many globally deployed IoT devices use multi-network roaming SIMs that can attach to several networks in a country, but some countries restrict long-term roaming by foreign SIMs. A local SIM roaming domestically is not affected.
No clear rule found: No information yet.
All networks and bands in Bulgaria → · The u-blox SARA-R510M8S in 172 countries →
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Sources
- A SARA-R5 series data sheet UBX-19016638: LTE bands by technology (as mirrored by alldatasheet) u-blox · 2026-10-02
- B u-blox SARA-R510S / SARA-R510M8S product specifications (LTE bands) Macnica · 2026-10-02
