Google Play Store mobile payment I'm haing a problem with google play store from few weeks, I can't purchase any app with carrier billing option.
it says "Your mobile payment service isn't available, try again later" any ideas how to fix this?
thanks
Carrier billing agreements are only set up on a few carriers in a few countries.

As of the end of 2013, that list is:


Country       Carriers                   
Australia     Telstra                    
Belgium       Mobistar                   
Germany       T-Mobile International, o2 
France        SFR, Bouygues, Orange   
Hong Kong     3                       
Ireland       3, O2                   
Italy         Wind Italy              
Japan         Docomo, KDDI, Softbank  
Korea         KT, SKT, LGU+
Netherlands   KPN          
Norway        Telenor      
Poland        Play         
Russia        Beeline      
Singapore     Singtel      
Spain         Movistar     
Sweden        3, Telenor SE
Switzerland   Swisscom
UK            T-Mobile International
US            AT&T, Sprint, T-Mobile, Verizon


(source)

If you're still having trouble, Google Play Support has some other troubleshooting steps you should try:

If you don’t see a carrier billing option under Payment options, here are some troubleshooting tips:


Make sure you’re connected to your carrier’s mobile data network (3G/4G), not Wi-Fi.
Direct carrier billing is only available on mobile devices using the  Google Play Store 
Google Play Store app, not computers.
Your account with your carrier must be in good standing.
Check with your carrier to make sure:

You haven’t exceeded your carrier’s monthly spending limit.
Your device and service plan allow premium content purchases.
Your device can use direct carrier billing.