Some R217 models (especially ZTE) require a "direct unlock" without a non-Vodafone SIM inserted. The provider will give specific instructions. For ZTE R217, you may need to dial a special code in the web interface (e.g., ##2539# or ##869434# ) to open a hidden unlock menu.

This feature would simplify the process for users who travel or want to switch carriers without digging through forums for unlock codes. One-Click Carrier Freedom