Device compatibility check explained: what an IMEI is, how blacklist vs whitelist rules affect activation, and why an unlocked phone can still fail (VoLTE/5G/Wi-Fi Calling limits, MVNO restrictions, international variants, or flagged IMEIs). Includes a dealer checklist for carrier IMEI checks and a simple script to set expectations before the sale.

VoLTE explained: Discover how Voice over LTE delivers HD call quality, faster connections, and future-proof compatibility. Learn what VoLTE is, why it matters, and how to ensure every customer’s device is ready.