I Have Just Joined The Company And Need To Introduce Myself Over The Phone To The New Colleague?

Hello anonymous, please consider following revision of mine :

Your original paragraph:

Hi! I am John. I am very glad to know all of you over the phone. I have joined our company since the beginning of this month. My position is XXX Manager. In future, if there have anything which I can help, please don't hesistate to let me know. Thanks a lot.

My suggestion:

Hi! I am John. I am very glad to get to know all of you over the phone. I have joined our company since the beginning of this month. My position is XXX Manager. In the future, if there is anything that I can help, please don't hesitate to let me know. Thanks a lot.

Thank you so much for your reply.

I will base on your revised version to talk my colleague today.

Thank a lot.

Hi!

You could also consider this.

Hi! I'm John. I'm very glad to get to know all of you. (I don't think you need to say "over the phone")
I've joined our company since the beginning of this month. I'm a/the (position). If there's anything I can help you with/can do for you, please don't hesitate to let me know. Thanks a lot.

Hi!

I noted your suggestion.

Thank you so much for your suggestion.

Your original paragraph:

Hi! I am John. I am very glad to know all of you over the phone. I have joined our company since the beginning of this month. My position is XXX Manager. In future, if there have anything which I can help, please don't hesistate to let me know. Thanks a lot.

Better (more native) English would be:

Hi! My name's John, I joined the company early this month as the XXXX manager. It's a pleasure to meet you all and I look for forward to working with you. If you need anything, please feel free to call or send an email. Thanks.

anonymousBetter (more native) English would be:

Hey, Anonymous,

The original anonymous post was a dozen years ago. They have probably moved on long since.