Formal:
* நான் மறுபடியும் அழைப்பேன் (naan marupadiyum alaippēn): This is the most direct translation and is suitable for formal situations.
Informal:
* பின்னாடி போன் பண்றேன் (pinnaadi pōn paṇṇṟēn): This means "I will call back later." It's more informal and casual.
* உங்களை மறுபடியும் அழைக்கறேன் (ungaļai marupadiyum alaikkaṟēn): This means "I will call you back." It's a bit more polite than just saying "I will call back."
Adding politeness:
You can add "சாரி" (sāri) meaning "sorry" to any of these phrases to be more polite. For example:
* சாரி, நான் மறுபடியும் அழைப்பேன் (sāri, naan marupadiyum alaippēn): Sorry, I will call back.
You can also use "தயவுசெய்து" (thayavuceythu) meaning "please" before the phrase to be even more polite. For example:
* தயவுசெய்து, நான் மறுபடியும் அழைப்பேன் (thayavuceythu, naan marupadiyum alaippēn): Please, I will call back.
Remember that the best way to say "I will call back" in Tamil depends on the situation and the person you are talking to.