1 : NETSIZE
http://www.netsize.com/Netsize covers around 29 countries in the world so it is safe to say that it is not very widespread. You can use it via SMS, MMS and WAP. You are provided a fantastic customers support with round-the-clock availability for incident response and resolution. The processes are much formalized too. It is always up-to-date with news rules and regulations across the countries it covers.
2 : ONEBIP
http://corporate.onebip.com/OneBip covers around 60 different countries and can be used via SMS, WAP and Mobile Internet. You need to register in order to use this application which also means that you will absolutely not have to put in any information every single time you purchase something online. Just login to your account once and that’s that. You can also manage your account via any PC or mobile device just because you registered. You should be able to view your transaction history and even add different mobile numbers if you so wish.
3 : JUNGLEPAY
http://www.junglepay.com/This is perhaps one of the best billing solutions for consumers and merchants both. The SMS billing covers round 80 different countries and it also supports many different platforms that range from web to mobile purchases and also applies to the in-app purchases.
4 : FORTUMO
https://fortumo.com/This application offers 1-click checkout which saves a lot of time. It also uses mobile operator billing so you can pay using your mobile operator. You can use this application on any android device. It is fully functional in over 72 different countries and with 250 different mobile operators. You have 32 different languages to choose from and you don’t even need a working data connection to use this application. Professional help is available to you round the clock.
5 : IMPULSEPAY
http://www.impulsepay.com/According to crunchbase the key component leverages “Direct to Bill” technology which allows ImpulsePay to apply a charge directly to a consumer’s mobile phone bill or credit within the network operators accounting systems. Once a consumer hits ImpulsePay’s payment gateway, they authorise the purchase by a sending or receiving a pin code. If they have sufficient PAYG credit or their contract is in good standing, then the charge is applied and they get sent to the success page specified by the content provider.
6 : TEXT2PAY
http://www.2pay.io/According to the official website Text2Pay takes the pain out of online purchases. With no credit card and no signup forms necessary, Text2Pay customers can quickly, safely and easily pay for virtual goods and currency using their mobile phone. It’s as simple as that.
7 : BOKU
http://www.boku.com/This is what Boku is according to the official website, ‘We make it simple for you to begin accepting mobile payments. By integrating BOKU Mobile Billing, your customers can charge their purchases directly to their mobile bill using just their mobile number. No bank accounts or registration are required, providing a frictionless checkout experience for increased conversion. Integration of our platform is simple.’
8 : SMSCOIN
https://smscoin.com/en/Currently SMS aggregator SmsCoin provides premium SMS payment solutions across 98 countries supporting hundreds of mobile carriers worldwide. There is a choice of several short codes operating with different SMS cost in each country. In vast majority of the countries connection of mobile payments does not require any additional approval, short codes become available for your project immediately following an SMS payment service set up. We offer exclusively high rates and attractive revenue share percentage, which might be increased along with the growth in your earnings. The terms of payments do not depend on the country and usually makes up about 45 days.
Personally I think that Fortumo and smscoin is one of the best and most used