Spectrum Mobile is now available for bring your own device option.
The new feature, however, is currently limited to select iPhone models. This means that Android device owners will have to wait until the MVNO starts accepting these devices for switchers.
If you own one of the compatible iPhone models, you can bring your device and activate service.
Here is a list of the iPhone models that are currently supported by Spectrum Mobile:
Apple iPhone SE - supports Verizon models or unlocked from AT&T and T-Mobile
Apple iPhone 6S and 6S Plus - supports all carriers but may require unlocking before porting
Apple iPhone 7 and 7 Plus - supports Sprint (unlocked) and Verizon models
Apple iPhone 8 and 8 Plus - supports all carriers but may require unlocking before porting
Apple iPhone X - supports all carriers but may require unlocking before porting
As for the newer iPhone models (Xs, Xs Max, and Xr), these are not yet supported by the MVNO. But there is a big chance they could be supported for bring your own device soon.