Direct answer
The short answer
A fob is a dedicated physical credential. NFC is a short-range tap-style method, while BLE can support phone-based access over Bluetooth at a configured range. Mobile access uses an approved app or digital credential. Availability and behaviour depend on the reader, software and building configuration selected for the project.
What to confirm for your property
The exact answer can change with building age, wiring, equipment compatibility, resident or staff needs and the final approved configuration. WeTech confirms these conditions during a site assessment instead of making a universal promise from a product sheet.
Existing condition
What is installed now, and what limitation is causing the problem?
User workflow
Who needs access, how should they use it and who will manage changes?
Approved integration
Which doors, gates, elevators, cameras or calling methods need to work together?