when you dial Dial: *#*#4636#*#*
and Check IMS fields, what does it show? The below is according to AI (so I’m sceptical how correct this is) required.
Overall AI states the bands are not important (only in some rural areas), important is rather the IMS profile.
- VoLTE Provisioned: Yes
- IMS Registered: Yes
- Emergency Support: Yes (guess that would be the key, being in Germany I dont have this at all).
Edit: I still think when FPs lists an operator as supported for VoLTE let them check and clarify, so get in contact with support.
This is also from AI, so def dont take this for granted, however that fact that their whitelist is the strictest is interesting in my eyes.
2. TELE2 – Emergency VoLTE Compatibility
Tele2 has one of the STRICTEST IMS whitelists in Sweden.
Fully supported
iPhone 6s → 16
Samsung (CSC NEE or HTS)
Sony Xperia (Nordic models)
Google Pixel 5 → 8 (but NOT 4)
Fairphone 4 & 5
Partially supported
- OnePlus 8–11
- Xiaomi EU models (12/13 sometimes work, but emergency IMS unstable)
NOT supported
- Poco/Redmi global & CN models
- Oppo/Realme
- Motorola G-series
- All rugged Chinese brands
- Pixel 4 (VoLTE glitch on Tele2; emergency attach fails)
- Samsung US-market models
Tele2 is the operator where most imports fail emergency calls.