There will be no service.  The main reason is because GSM is based on TDMA,
which has practically nothing in common with CDMA, even though they may use
the same frequency bands.

Question:

Can someone tell me with factual support for their answer, if a GSM quad
band cell phone enters into a CDMA only network service area, will the GSM
cell phone be able to roam on the CDMA network?  Or will there simply be no
service for the GSM phone?

Thank you!

Zipper Head

The GSM phone will only see the CDMA base as noise, and vice versa.
GSM uses a QPSK modulation scheme on a time division basis (217 time
slots per user per second, 8 users per 200 Khz channel).

CDMA involves essentially continuous tranmission using a spreading
code in a 1.23Mhz Channel.  Neither system has the ability even
recognize the existence of the other. If they occupy the same
spectrum, odds are the CDMA system will come out worse for the
experience.

GSM phones will not work on a CDMA network.  If there is no GSM signal
available you will have no service.

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