If you are looking for some of the most popular prepaid phone companies, undoubtedly Nobelcom is going to be on the top position. Though there exist series of such companies, yet Nobelcom is the best among them as they have their own line of phone cards. So you have to pay the rates fixed by the company and no middle-man prices are included. Also with their technical facilities, in case you have any technical issues, they will fix them in no time at all.
They offer fair prices and very decent amount of fees are attached unlike other phone cards. Also they provide you with 15 minutes, trial period, so that you can use it and see for yourself that whether the service is up to your expectations or not. Also since every country has certain protocols for telephone communication system, you can get an idea about the service without investing a penny in it.
With Nobelcom, you get 24×7 online customer support apart from live chat. The response time is pretty good and is as low as 2 minutes only. However $2 processing fees is charged for services under $40, but the credit card security is taken very seriously and hence it is worth trying.