Hey @Bill
You seem to have a pretty good handle on the situation. I don’t see anything in your last post that was inaccurate. Here’s some more info about the chips that might answer your questions:
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NExT:
A “dual-frequency” implant. It has two antennas in one implant. Each antenna circuit is tuned to one of the most commonly used RFID frequencies (125kHz and 13.56MHz.) Your phone can interact with the 13.56MHz (NFC) side without having any effect in the 125kHz side, because they’re tuned differently. To write to the 125kHz side you’d need some kind of writer/cloner, but you need to be careful when doing so. -
Samsung SHP-DS510
You should be able to register your implant as a key for this door lock, because it operates at the same frequency (13.56MHz.) I don’t see it onthis list, but I think it will still work. The locks usually register a unique identifier(UID) inherent to each chip, so it shouldn’t be able to tell the difference between an implant and a regular NFC card. Sometimes they’re looking for a special “class” of card (like MIFARE) which could present a problem. Someone with more experience setting up Samsung locks might be able to say more. -
Antenna shape
The NExT is the best bang for your buck, and implanting it is very easy (it’s tiny and pre-loaded into a sterile syringe). The only potential issue is “coupling”. Locks and phones sometimes have a hard time reading the glass tag implants, because they use different shaped antennas (cylindrical vs flat.) If you use a NExT, you may have to contort your hand strangely to get a reliable read. Another option is the flexNT. It doesn’t have the added 125kHz functionality, but it is much easier to get a read because of the flat antenna. The only downside is that the install is more difficult. You can still use a piercing needle, but you need to make a pocket and insert the tag, rather than injecting it. Thankfully, both of these tags will allow you to write URL links using software like TagInfo.