O2

Germany ★★★ Verified Customer: 55222

O2 Germany is Germany's third-largest operator, owned by Telefonica Deutschland. After 2014 merger with E-Plus, around 31% market share. USSD *101# for balance, *102# for validity, *103#<voucher> for top-up, *104# for data/smartphone packs, *107# for plan queries/switching, 5667 for IVR. Mein O2 app for self-service.