If an iPhone apps seems to be locked up: Hold the Home button for six seconds. This should bring you to Home.
If that doesn't work, try reseting your iPhone.
How to reset an iPhone: Press and hold the Sleep/Wake button and the Home button until the Apple logo appears.
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Links:
[1] http://www.maclife.com/article/find_wifi_hotspots_for_your_iphone_or_macbook_with_jiwire
[2] http://www.maclife.com/article/iphone_meets_web_2_0_first_look
[3] http://www.maclife.com/article/jivetalk_for_iphone_first_look
[4] http://www.maclife.com/article/how_to_instant_message_on_an_iphone
[5] http://www.maclife.com/article/goffice_word_processing_on_the_iphone
[6] http://www.maclife.com/article/v_moda_vibe_duo_first_look
[7] http://www.maclife.com/article/how_to_check_your_iphone_minutes