You can top up credit on O2 by using Thai Bank Transfer, Visa, Mastercard, JCB, Alipay, Cryptocurrency or your Coins.ph wallet. Easily bookmark your payments here: mobiletopup.com/topup/germany
Reload any pre-paid phone on the O2 in and cheap, fast and secure way.
To check your account balance: Dial *101#
To check validity: Dial *102#