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Context: From the office, I am telling it someone on the phone.

I just reached the office.So, I am settling now. Once I settled, I will call you.

Please check the sentence.

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kumenglishContext: From the office, I am telling it at the office and saying this to someone on the phone.
kumenglishI've just reached the office. So, I am settling now. Once I settled, Please give me a couple of minutes, and I will call you back.

You can also say "I've just got to the office" or "I've just arrived at the office".

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Thanks for your modified version.

However, When can we use "I am settling"?

https://www.lexico.com/definition/settle