- A1 Telekom Austria
- American Express
- Elisa Oyj
- Google Play Balance
- KPN (Koninklijke KPN N.V. Netherlands)
- KPN (Koninklijke KPN N.V.)
- MasterCard
- O2 Slovakia
- Orange (Belgium)
- Orange (Slovakia)
- PayPal
- PaysafeCard
- Proximus Group
- T-Mobile International (Austria)
- T-Mobile International (Germany)
- T-Mobile International (Slovakia)*
- Telefónica Deutschland
- Telia (Finland)
- Telkom
- Three (Hutchison Drei Austria)
- TIM (Telecom Italia)
- Visa
- Vodafone (Germany)
- Vodafone Italia
- Vodafone Libertel
- Vodafone Portugal
- Wind Telecomunicazioni
- Zain (Mobile Telecommunications Company)