NFC Tag Not Working with Your Phone Case On

If your NFC tag works without your phone case but fails when the case is fitted, the issue is usually caused by the materials or design of the case, not the lock or the tag.

Why This Happens

Case Materials Can Block NFC

Some phone cases contain materials that weaken or block NFC signals, including:

• Metal plates or rings

• Magnetic mounting components

• Thick layered designs

• Built-in wallets or card holders

These materials can reduce the signal strength so the phone cannot detect the tag.

MagSafe-Style Cases Can Interfere

Cases designed to be MagSafe-compatible often include:

• Magnetic rings

• Alignment plates

• Reinforcement layers

Magnets themselves usually do not stop NFC from working, but the extra components and thickness can interfere with the signal.

How to Fix It

Try the following steps:

1. Remove the phone case and test the NFC tag again

2. If it works without the case, the case is the cause

3. Use a thinner, non-metallic case instead

4. Avoid cases with metal rings, plates, or card holders

Key Point

NFC requires the phone to be very close to the tag.
Anything that increases the gap or blocks the signal, even slightly, can stop it from working.

Switching to a thinner or non-metallic case usually resolves the issue.