Hello. First of all, easy jtag software dont use credits for any operations. Also:
1. We can check this card for block. But owner can block it via reseller in future.
2. Account not included to software, you need to buy it, then you can use it with samsung or lg tool if you activate them in future.
3. Exectly what device you want to buy?
In any case, we strongly reccomend buy our products only from official resellers to avoid any problems.