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If you're capturing in monitor mode, then, if you're on a "protected" network (with WEP or WPA encryption), the packets are encrypted, and you'll have to provide a password and may need to arrange to capture the packet sequence sent when your phone joins the network. See the "How to decrypt 802.11" page in the Wireshark Wiki.
If you're not capturing in monitor mode, you won't see any traffic other than traffic going to and from the host running Wireshark.
(These apply to all Wi-Fi sniffers, not just Wireshark, although not all of them support decrypting packets.)