Final answer:
Scam Shield, free Caller ID, Turn on Scam Block, and free PROXY by DIGITS line are features in a mobile plan that help protect against scam calls, identify callers, and offer an additional phone line for privacy.
Step-by-step explanation:
The terms Scam Shield, free Caller ID, Turn on Scam Block, and free PROXY by DIGITS line are all features that may be included in a mobile phone plan to enhance user security and convenience. Scam Shield is a service that helps protect users from scam calls by identifying and blocking potential scam numbers. Free Caller ID is a feature that allows users to see the caller's number and name before answering, even if they're not in the user's contact list. Turn on Scam Block refers to the option to automatically block numbers identified as scams from reaching your phone. Finally, free PROXY by DIGITS line is likely a service by T-Mobile that allows users to have an additional phone number for their existing smartphone, which can be useful for maintaining privacy or separating work and personal calls.