I have bought three or four. It has happened to me to receive wrong coordinates from the beginning and then after three or four messages the correct coordinates are sent. In any case, if you use it daily, it will last for a maximum of one year.

Waste of money! I still regret it.. I have had it for about 3 years! It never worked as it should. I bought an extra SIM card for the mobile phone it required, but it was an additional 10€ wasted. The instructions were not helpful at all. I managed to make it work only in terms of sending me coordinates via SMS. The real-time function doesn't work at all! Stay away from this product. It's the most useless thing I have ever bought.

It is terrible, it never worked.
I bought the requested card, but for 10€, I took it to the store for repair and they told me it cannot be repaired.
43€+10= 53€ wasted

The product is too big to wear on any pet (the photo also showed a cat). The application definitely needs improvements to function properly.

It broke before a year and they informed me that it cannot be repaired and that the warranty is three months, while they tried to convince me that it must have been heavily damaged in order to break (nonsense). If I had known that I was spending so much money on something that the manufacturer expects to last only three months, I wouldn't have bought it.

I have had this specific GPS for a year. The instructions are not clear, it took me a long time to figure out how to set it up (it doesn't mention anywhere how to disable the request for a pin on the card, I found it by chance while searching on YouTube).
Also, the application is terrible (the real-time tracking doesn't work).
At least with a phone call, you receive the coordinates in a message and you can slightly orient yourself. It is useful, but the time it takes for the message to arrive is enough for the dog to move from the spot and you end up searching there in vain.
I regret the purchase, I should have looked for something better or at least something that the producer would care about the application and the real-time tracking would work as intended from the beginning.