Consider the following points, features and nuances:
1. Non vbv bin can get into the stop list after 7-15 balance replenishment, it is required to have new actual bins every time.
2. Ask the sellers for suitable bins, but many of them say tested and suitable bins at once, and also indicate a link to the crypto exchange in which they are suitable.
3. There are a lot of new applications for buying cryptocurrency and they are very supportive to each client, and their protection is very weak.
4. Replenishment of the balance from one card should be performed not so often, it is advisable to wait for some time, at least 1-2 hours before the next replenishment.
5. When working with the application, it is advisable to configure (rooted) the phone to match the country of the map you plan to use.
6. After the withdrawal of the cryptocurrency, it can be replaced in reliable cryptomixers in order to confuse the traces.