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By referring sites, I can say that difference between 6720 and 6220 is as follows:
Nokia 6220 Classic has standby time 250 hrs, talk time 250 mins, push to talk feature and an internal memory is 120 MB. On the other hand, 6720 Classic has standby time 500 hrs, talk time 450 mins and an internal memory is 50 MB, but it has not push to talk technology.
Moreover, Nokia 6720 Classic supports an audio messaging, OVI chat and windows live messenger which is not available in 6220.
Nokia 6220 Classic has standby time 250 hrs, talk time 250 mins, push to talk feature and an internal memory is 120 MB. On the other hand, 6720 Classic has standby time 500 hrs, talk time 450 mins and an internal memory is 50 MB, but it has not push to talk technology.
Moreover, Nokia 6720 Classic supports an audio messaging, OVI chat and windows live messenger which is not available in 6220.