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One of my favorite technologies is NFC. I'm blown away that I can write data to a little chip and then access that using a phone or tablet. I've embedded NFC tags into all sorts of things, from documents to business cards to 3D-printed objects.
The NTAG215 stickers are cheap and perfect for disposable applications.
Writing a few dozen tags with a smartphone app is fine, but if you find yourself wanting to write a lot, you're moving into the realm of an industrial setup like the Sato CT4-LX.
Also: I found AirTag alternatives that are tough, loud, and compatible with Android phones
You have the tags, the app is installed, and you're ready to write your first tag. To write a tag that opens a webpage, tap Write, then Add a record, tap URL/URI, enter the address of the web page you want to open in the box, and tap OK.
Now, to write to the tag: tap Write, then bring the tag to the back of the smartphone. It should detect the tag and write the data to it. It's that easy!
To test the tag, exit the app, bring the tag up to the back of the smartphone, and it should be picked up and prompt you to go to the web page.
Also: Finally, Bluetooth trackers for Android users that function even better than AirTags
But you're not done. Remember that NFC tags are rewritable, and you don't want others fiddling with tags you've placed on things, as this could be a big security issue.
You have two options, both available in the NFC Tools app. You can password-protect the tag or lock it.
With stickers, I tend to lock these, as it's quicker (you don't need to create or remember a password), but for reusable tags and cards, the password option allows for future reuse.
Password protecting a tag allows it to be re-written in the future, but prevents unauthorized tampering.
The choice is yours, but you need to do one or the other to protect the tag from being altered.
And there you are. Done. Working with NFCs is that easy.
You can create an NFC tag to share your Wi-Fi password. If you want to do this, in NFC Tools, you'd add a record for Wi-Fi Network and enter your network's details. I find this a super handy way to share the password for my guest Wi-Fi.
Also: How to find out if an AirTag is tracking you - and what to do about it
Experiment with what the app offers; there's a lot in there.