User's Manual

APPLE CONFIDENTIAL — PRELIMINARY DRAFT
the cellular signal is weak 
a temperature warning screen appears 
Important: You cannot use iPhone while the temperature warning screen is displayed,
except to make an emergency call. If iPhone can’t regulate its internal temperature,
it goes into a deep sleep mode until it cools. You cannot make an emergency call
when iPhone is in this mode. Move iPhone to a cooler location and wait a few minutes
before trying to use iPhone again.
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Appendix A Support and Other Information