[Q] Phone switch too late between WCDMA and GSM mode? - Galaxy S II Q&A, Help & Troubleshooting

My SG2 is set up in network mode with GSM/WCDMA(Auto mode).
When I’m home the signal strenght, WCDMA, is -101 dBm 7asu and the voice quality is very bad, almost unusable.
When I manually switch to GSM the signal pops up to -73 and 15 asu and I can talk with a sound quality as it should be.
To me it seems that the phone doesn’t switch to GSM, or too late, when the WCDMA signal is bad.
I have tried quite a few different modems for the SG2 but I can’t see any difference between the versions. Maybe it’s the network provider that manage when to switch?
If would be great if someone could give me some info. on how the switching between WCDMA and GSM works, and the thresholds.

GSM auto (PRL) will favour GSM over 3G.
I am not sure if it will work with your network, but you can only try...........
There are a few apps around that will do it, or you can just use the following:
1. Phone dialer *#*#4636#*#*
2. Phone info
3. Set preferred network type to : GSM auto (PRL)
Edit: I am not sure if it will revert after a reboot.
This post was rather useful info, although different phone and network, principle is the same:
http://forum.xda-developers.com/showpost.php?p=6591404&postcount=1

Related

[Q] Has anyone been able to place calls in 'EvDo only' mode?

So using the secret menu, I was trying different methods to see what signal strengths I was getting at my place, same spot. Interesting enough, the signal strength bars are different when using CDMA auto prl (4-bars) and EvDo only (2-bars) mode, even though I still see the 3g icon. Also, it seems the 1x radio is always on in every mode except EvDo only, plus I tried calling using all 5 modes.
Thus far, (1-yes, 0-no) I can make a call in mode:
CDMA auto PRL - 1
CDMA only - 1
EvDo only - 0
CDMA + LTE/EvDo - 1
LTE only - 1
so my question is, why can't I (and is anyone able to) make calls over EvDo only mode? When I place one, it hangs for a sec, and ends automatically saying "Call was lost". I was hoping to get better call quality (even if I can't have 4g speed), cuz right now calls sometimes sound muffled (but clear enough to understand), compared to when I had my nexus one on t-mo. (I tried eHRPD and EvDo-rev.a modes to no avail)
PS I know (atleast I read somewhere) that the T-Bolt cannot support calls over LTE itself, or VoLTE as it's called (unless if that's changed or I am wrong.)
Any thoughts? your experiences? I just want to get ppl's thoughts on this.
So... I guess no answers then?
Well, EvDO-only would not permit any voice calls because you've told the radio to only operate with a data signal. EvDO, or "Evolution-Data Optimized", is the 3G data component of CDMA wireless networks, so without a preferred network mode that includes CDMA you won't have any voice service.
when i had my phone on evdo only (stupidly thinking it was 1x) i couldn't make or receive any calls
evdo handles data, 1x handles calls/sms
squeakyl said:
when i had my phone on evdo only (stupidly thinking it was 1x) i couldn't make or receive any calls
Click to expand...
Click to collapse
Right. CDMA = 1x data and voice EVDO = data only. If you force the phone into a data only mode, voice will not function.

Disable HSPA/3G, leave only EDGE/GPRS etc?

From what I've read, it's possible to to disable the high speed connection and leave only EDGE and other slow connection by change network mode to GSM only. However when I tried that on mine, I lost all connections altogether include voice call, and left with "unregistered sim, emergency call only". My carrier is CDMA, so not sure if that has anything with it.
What am I missing here?
Hspa 3g only on gsm system.
For cdma you have 1x and evdo..don't know if you can disable evdo or not. Please see setting/wireless & networks
Sent from my GT-I9100 using Tapatalk

how to set network mode for only hSPA on GPE

I have a one converted to GPE and where I live I get great LTE coverage. However at work its weak and my one is constantly switching between LTE and hspa.
How would I set my phone to only connect to hspa while at work to avoid the constant switching? In setting under network mode there is only options for LTE 3g and 2g.
Does 3g include hspa and if not I've read about a code to enter from dialpad that allows u to set netowkr. I need a method that will allow me to easily switch it depending on where I am.
If anyone knows how to do this any help would be great.

Preferred Network Type Options

Hi guys, just a quick question here. My LTE (4g) is hit and miss so I currently have it set to WCDMA preferred/GSM.
Is there such an option that can give me WCDMA preferred/LTE? (So that my phone can automatically switch to LTE in areas where's its stronger than WCDMA)
If I have it on default LTE preferred it will only switch to WCDMA when LTE is non existant which is useless. I just want it to switch to what ever has the highest signal.
Cheers ?

Guide: Force 4G/LTE When Stuck on 3G, Korean LG G6 (LGM-G600L)

UPDATE: Use the app to select "LTE/CDMA/UMTS auto (PRL)" which starts as LTE but will switch to 3G to make voice calls. if you force LTE alone then voice calls won't work.
This is simple once you know how but otherwise most would probably assume a 3G only area or forget the device is actually 4G capable. So this another eccentricity of this model. I was told that I should definitely be getting 4G/LTE at my address when the phone would only connect to 3G. But various guides recommend changing "Network Mode" to force 4G. However this model does not have this setting. I had to install "4G LTE Switcher" and switch to "LTE/WCDMA" and now get 20.7 Mbps according to Google Speed Test, when on 3G I was at 11 Mbps.

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