There is no real future tense in English. The verb form we choose depends on what you are thinking when you speak. In general, be careful with "will" for the future.
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Sarojwal GunjanTom (call) is going to call whenCorrect. Could also be Tom will call but since there's no indirect object such as me in this clause, the longer structure is going to call may
Sarojwal GunjanOn a website- englishpage.com
the correct answer(as displayed) for a grammar test question is:
Tom (call) is going to call when he (arrive) arrives