Verbseoul.
하다 verb
통화하다tonghwahadato talk on the telephone

To say to talk on the telephone politely in the present tense, use 통화해요 (tohng-hwah-hae-yoh). Below is the full conjugation of 통화하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
통화해
tohng-hwah-hae
통화해요
tohng-hwah-hae-yoh
통화합니다
tohng-hwah-hahm-nee-dah
Past
통화했어
tohng-hwah-hae-ssuh
통화했어요
tohng-hwah-hae-ssuh-yoh
통화했습니다
tohng-hwah-hae-sseum-nee-dah
Future
통화할 거야
tohng-hwah-hahl- -guh-yah
통화할 거예요
tohng-hwah-hahl- -guh-yae-yoh
통화할 겁니다
tohng-hwah-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
통화하세요
tohng-hwah-hah-sae-yoh
Suggestion / Let's Polite (요)
통화해요
tohng-hwah-hae-yoh
Question Polite (요)
통화해요?
tohng-hwah-hae-yoh-?
Connective “and” — (고)
통화하고
tohng-hwah-hah-goh
Conditional “if” — (면)
통화하면
tohng-hwah-hah-myuhn
Noun form — (기)
통화함
tohng-hwah-hahm