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Review: Palm Treo 750

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Dropped Calls


Jan 26, 2007, 11:42 PM
I have also noticed the dropped calls. It only happens when UMTS is engaged. I have set the band to GSM instead of auto. I have not had one call drop while on GSM. I hope that the update for HSPDA will correct this.

You should test furthur selecting between the GSM and UMTS band.

As the Treo 750 is one of the best devices I have ever used.

Nice review



iDen: Original Nextels (Duel Set) maybe i205?

Nokie 8260 -> Nokie\a 2260 -> Nokie 3360 -> Motorola V60 -> V551 -> SDA (Unlocked) -> TYTN (Unlocked) -> TREO 750v (the Best!)

Sanyo VM4500 -> Sanyo 8200 -> Sanyo MM5500 -> Blackberry 7250 -> Motorola Q (The Best Smart Phone)

Jan 27, 2007, 3:58 PM
yes, i have had several dropped calls since Ive started using the 750. makes it hard to do business on the phone. Im returning the 750 because of it.

Jan 27, 2007, 8:26 PM
Try the following

01. Right Ket [Menu] -> Preferences -> Phone Settings

02. Services -> Band Selection

03. Change network type from Auto to GSM.

See if this stops the dropped calls.

I am happy to give up the UMTS until there is a firmware update with the HSPDA enables officially. This device is that good. I use it on GSM for now and have no problems. If I need to do heavy browsing I reenable the auto band selection. Then go back to GSM later.


Jan 31, 2007, 12:21 AM
Through long testing with both the 8525 and Treo 750 concerning these issues, I was able to determine the problem. Unlike the 8525, the Treo has the ability to correct this issue with the previously listed band select option.

I live on the border of UMTS coverage and this is a MAJOR problem at home. My UMTS signal strength in my home office is about 1 bar, but when the phone switches to GPRS it's almost full strength. My phone if left alone on the desk will default to UMTS and will stay there if I don't walk around the house on a call. When a call is in progress, if the call started with a U on the screen and switches to G during the call, all sorts of issues arise. I don't drop calls, but I lose many functions until the call ends.


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 ...

Feb 1, 2007, 8:18 PM
JoeDaddy, sounds like the logistics of your house is in hand-off spot where the HSDPA/UMTS network stops and hands off to the EDGE network. If you can picture your phone on the top of a fence, it can fall either way but is doing a balancing act and probably confusing the phone to pick one of the two networks for a hand-off. Hence the phone probably freaking out and hosing the functionality as you described in your post. I would normally say 99% of the time, any UMTS/EDGE phone would not be in your situation but be mobile to do a proper hand-off or be total transitioned to UMTS or EDGE signal.

On the bright side, as you stated, the 3G devices are AWSOME and no CDMA/EVDO network can touch the simultaneous voice and data connection. From wh...
Real Johnny Utah

Feb 10, 2007, 11:33 AM
When using UMTS, you might experience some more frequent dropped calls if you are on the edge of coverage. Going from UMTS (whether its HSPDA or not doesnt make a difference) to GSM, sometimes the handoff will cause the drop. But if you are in solid UMTS coverage, you should be fine.

I use the Treo 750, it replaces my 8525 (which is a good phone too) and I love the treo. It has been one of the better PDA/Pocket PC's i have used call wise.

Jan 28, 2007, 4:05 PM
LOVE the 750! Previous device used was the 8125, so definitely appreciated the OK button. My first demo device was an unlocked Vodaphone 750v. Dropped calls constantly, no matter where I was. It would completely lose it's signal to the network, at which point I would have to turn the phone signal off then back on again for it to reconnect to the network. Next, I was able to use a Cingular 750, same SIM card. It has never dropped a call once. A co-worker then tried my original 750v and had the same dropped calls issue. He then tried a different 750v; no dropped calls. Our conclusion: the original was a lemon or needed to be repaired.... Sounds like it could be a wider spread problem with manufacturing, though I did not try the UMTS ...

Jan 31, 2007, 7:52 AM
Here we go again. Everyone loves the treos and there layout, but remember these are phones first and if the phone part is terrible that all the other pros of the phone dont matter.

I am a cellular dealer and 75% of my sales are PDA'S and the Treo 700 small antenna is its weakness and the reason for all of the dropped calls, now palm is removing the antenna with an embedded one. You think palm would fix this terrible problem. I modified a Treo 600 antenna and installed it on my Treo 700. The 3mm larger antenna is a 1000% improvement. If I could just get the mobile 5.0 to become more stable. I have to reset my Treo daily. The Treos poor cellular quaility has boosted my RIM Blackberry sales 153% this year. My customers buy the Treo first bec...
eric Lin

Jan 31, 2007, 1:57 PM
while i can't speak to the long term durability of the 750 (we don't exactly drop-test these phones.) i can say we did not have any problems with the antenna strength. the built in antenna was more than capable of getting a signal, even in the underground vault we test in. the problem appears to be a firmware related malfunction.

Mar 3, 2007, 3:16 AM
Hi guys I can confirm that I have the same problems on several networks in Europe as well. It is not only about dropped calls, but I also completely lose reception without any intervention.

The worse is that Treo doesn't start searching for new reception, it just remains without signal and I can only reset or restart the phone app.

I cannot avoid this by switching to GSM only -> the same problems...

But interesting is that I have these problems only when I am in roaming networks like in Czech republic in T-Mobile, Vodafone or o2.

In Germany I don't have these problems at all.

Now I got my already 3rd Treo 750 and it's the newest unbranded one with HSDPA....the same problems!!!

Anybody knows about a new firmware?

Feb 3, 2007, 12:43 PM
Eh? Waiting for a firmware upgrade for fixing anything to do with the radio portion of the Treo 750. I have had a 700 (actually on the 5th now) and all with the same problems that you describe; full signal showing and dropped calls. Treo makes a wonderful PDA, but the phone part of the equation is as bad as the PDA is good. In Florida, where the land is flat and towers plentiful, the phone works fairly well' but back home in Illinois, where the towers are farther apart, using the phone initializes one footitus. Move your head either one foot to the left or right and the signal is right there. Otherwise, you get dropped calls, no calls, or no service. This is true whether it be Cingular or Verizon. When calling either of those carriers, they ...

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