The network of these shops helps a lot, you can find almost everything you suddenly need!! But often cheaper SIM cards are sold, they are offered more expensively, and it is almost always crowded.
A small but quite capacious shop, there is almost everything you need, but the service is ON GUARD, the sellers do not want to contact you, if there is no translator, it will be difficult, they do not need sales, so you can leave with nothing ((((