I'll call him to make sure. vs I'm going to call him to make sure.

[sadra1400]

Are these results correct? I do not understand on what basis these results were taken?

I'll call him to make sure. → I'll do it right away.
I'm going to call him to make sure. → I'll do it eventually, but not right away.

 

[5jj]

I'll call him to make sure.
I'm going to call him to make sure.

Neither sentence tells us when the call is to be made.

I do not understand on what basis these results were taken?
I don't know what you mead by that, I'm afraid.

 

[teechar]

Are these inferences correct? I do not understand on what basis these results were made. taken?

I agree with you and with 5jj. There is no obvious justification for those inferences.

 

[Skrej]

It's not an ironclad rule, but in regards to future plans or intentions, we tend to use 'will' for spontaneous decisions made at the moment of speaking, whereas the 'going to' form' is used for speaking of plans we've previously made.

However, as already mentioned, neither form references distance into the future.