Is there any app or trick to get notification upon answer or comment on my question, on my iphone
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When posting a question you can specify whether or not to be notified via email; this is no longer (not sure it ever was) a per-question setting, but applies to the way Stack Overflow will notify you in general (in fact, the link on the question asking page just expands your Stack Exchange notification box, where the settings can otherwise be accessed manually).
This gives you numerous options: you can receive unread notifications three-hourly, daily, or weekly. Your iPhone can surely then access your emails.