Now to tell you the truth we have never heard of Petrol Mobile, so here is some details for you about them.
Petrol Mobile is basically a Mobile Virtual Network Operator (MVNO) that operates in Bulgaria, the company is owned by a Bulgarian company whose operators are Petrol AD, they mainly engage in oil distribution.
Well they also offer prepaid package for voice transfer (calls) and short messages (SMS), they run without other features like MMS, Internet access, etc. The company mainly aims its business at pensioners and university students who are normally have a lower income.
We have seen on their site after translating it obviously that they offer the best price in the country at 0.29 per min, one price for all mobile phones and domestic, they reach 99.9 percent of the country’s population, no monthly fees, no contracts and you do not have to pay for facilities that you do not use. Visit Petrol Mobile here.