NFC (Near Field Communication) là công nghệ kết nối tầm ngắn với nhiều ứng dụng:
**NFC là gì?**
- Near Field Communication
- Khoảng cách: 4cm max
- Frequency: 13.56 MHz
- Speed: 424 kbps
- Two-way communication
**Công dụng chính:**
**1. Thanh toán di động:**
- Apple Pay
- Google Pay
- Samsung Pay
- Banking apps
- Transport cards
**2. Pairing devices:**
- Bluetooth speakers
- Headphones instant pair
- Smart watches
- Printers
**3. Smart tags:**
- Automation triggers
- WiFi sharing
- Business cards
- Location tags
**4. File transfer:**
- Android Beam (old)
- Nearby Share
- Photos/videos
- Contact sharing
**5. Access control:**
- Hotel room keys
- Office access
- Car keys
- Smart locks
**6. Public transport:**
- Metro cards
- Bus passes
- Tap to pay
- Balance check
**Setup và sử dụng:**
1. Settings → Connections
2. Toggle NFC ON
3. Add cards to wallet
4. Tap to pay/connect
**Bảo mật:**
- Tokenization
- Biometric required
- Short range secure
- Encrypted data
**Pin impact:**
- Minimal when idle
- Active only when tap
- 1-2% daily drain
- Worth the convenience
**Phones với NFC:**
- iPhone 6+ all models
- Samsung mid-range+
- Most flagships
- Some budget phones
**Tips sử dụng:**
- NFC stickers for automation
- Share WiFi password
- Launch apps with tags
- Smart home triggers