I have bought three TK102 clones so far, please correct me on any of this, I read that the only difference between 102 and 102B is you can put a SD card in the 102B. I suspect all of mine are clones.
One of them has a red LED, one has a blue LED and one has a green LED, the red one won't work at all, it comes on and stays on, it never starts blinking and won't respond to commands. The blue one comes on and begins to blink when it get a signal. The green one come on and blinks about every ten seconds or so.
The red one is useless, won't work at all, the blue one works with some commands but not all. It won't respond with the movement or over speed alarms. Everything else seems to work.
The green one works very well and will respond to all the commands I send it. I have been asking sellers on eBay what color the LED is before I will buy one, I will only buy the green ones now. Every one of the sellers I bought from show pictures with the little snap catch on the battery case, but none of the ones I received have that type of back. Is that one with the latch a newer or older model? (see pic).
Also the blue one is a cheap clone, the blue LED is not lined up with the hole and you have to look at it on an angle to see it. I use a T-Mobile sim card for them and I heard that AT&T was the only other card that will work. Also read that Verizon will not work or I would get a second line on my wife's account.
QUESTION: since the unit is only receiving and sending texts, I don't need a data plan on the sim, Correct?