There are 7m people live in Bulgaria. They use 801 ASNs with around 5m unique IPs.
Get your proxy from litport and you will be able to get many of these residential IPs. It works best for facebook accounts and any other business that require the highest level of privacy and security.
You can choose among multiple cities and mobile carriers. No contracts, no commitments.
At this moment we don't have available mobile proxies in Bulgaria. BUT! We might have it available, but for private usage. Please, contact us and find it out.