Unverified50% confidenceFactExact time
US carriers employ a strict device whitelist system, whereby only devices whose IMEIs have been tested and certified by carrier laboratories are permitted to register for VoLTE service.
1
Sources
50%
Confidence
Long-term
Relevance
8/19/2026
First Seen
Sources
Volla手机能用AT&T吗？美国运营商兼容性深度解析
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