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Review: Palm Treo 750

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Top message:  Dropped Calls by graylion   Jan 26, 2007, 11:42 PM

Replying to:  Re: Dropped Calls by JoeDaddy   Jan 31, 2007, 12:21 AM

Re: Dropped Calls

by aegrotatio    Feb 1, 2007, 9:55 AM

The dropped calls on UMTS are because the UMTS band is at both 1900/850 MHz and the phone's radio will have an affinity to one or the other band for voice. Cingular voice calls have an affinity to the 850 MHz band because its signal is stronger, but I guess this phone prefers 1900 MHz when data is engaged.

When UMTS is engaged the phone is evidently using 1900 MHz for voice which is unfortunate because HSDPA uses 1900 MHz for download and 850 MHz for upload (or is it the other way around?). I dare suggest that voice calls when UMTS is engaged always use 1900 MHz. Cingular's voice network on 1900 MHz inherited from AT&T positively stinks.

It seems like it would be fixable through software.

Note that if you have T-Mobile you don't have these intermittent problems--it uses 1900 MHz all the time (and also EGPRS all the time), so it stinks all the time at least in my area.

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