po telefonu — on the phone / over the phone
mobilní telefon — cellphone
Můžu použít tvůj telefon? — Can I use your phone?
| Case | Singular | Plural |
|---|---|---|
| nom | telefon | telefony |
| gen | telefonu | telefonů |
| dat | telefonu | telefonům |
| acc | telefon | telefony |
| voc | telefone | telefony |
| loc | telefonu | telefonech |
| instr | telefonem | telefony |