Can you please correct the following sentence
I have been trying to reach Raj through phone, in vain
Hello Suma, welcome to UsingEnglish!
I'll underline the part of the sentence that is incorrect:
1. I have been trying to reach Raj through phone, in vain.
Have a look at this Google search, and see if you can work out which preposition you should use:
??? the phone
If you post your answer, I'll check it for you later.