Develop Bugs

i was reading this battery saving guide and i wanna make sure i did this right

well i was reading this guide and came across tip #22.
well that guide was made for the evo which is a cdma phone but when i checked my preferred network settings it was on wcdma preferred. since my G2 is a gsm phone,i changed it to "gsm auto (prl)".
was this the correct choice or should i have it set to wcdma?
thanks for any help!

durps said:
well i was reading this guide and came across tip #22.
well that guide was made for the evo which is a cdma phone but when i checked my preferred network settings it was on wcdma preferred. since my G2 is a gsm phone,i changed it to "gsm auto (prl)".
was this the correct choice or should i have it set to wcdma?
thanks for any help!
Click to expand...
Click to collapse
Depends on what you are trying to achieve. GSM Auto (Prl) will switch between 2G and 3G based off what the tower is telling it to be on and the strength of the signal. From my experience this is the best setting for use and don't worry. Personally, I usually put my phone on 2G only, and only switch to 3G when I am going to be using the data.
WCDMA Preffered and WCDMA Only is telling the phone to hold 3G as long as possible, and if there is any 3G coverage to switch to it, or in the case of Only it will never switch off 3G, even when there is no 3G coverage available.
If you are trying to save battery GSM auto or GSM Only are your best bets, if trying to preserve a weak 3G signal for data WCDMA only, and if you are somewhere that gets decent 3G but the phone loves to switch to 2G for some odd reason, WCDMA Preferred.

Useful General Information Regarding 2G and 3G for either CDMA or GSM modes

Useful General Information Regarding 2G and 3G for either CDMA or GSM modes
For CDMA Networks there are Only three Modes Controlling CMDA 2G or 3G:
CDMA only CDMA phone force Only 2G Mobile data. if 2G signal is too low you get no Signal.
EvDo only CDMA phone force Only 3G Mobile data. if 3G signal is too low you get no Signal
CDMA auto (PRL) CDMA phone can use both 2G and 3G Mobile data . if signal strength is low then 2G is favored more.
Please see Automatic Mode ( GSM/CDMA auto (PRL)
TWO GSM Modes that include the word "CDMA ",But They Do Not Relate to CDMA Networks :
WCDMA preferred GSM phone can use both 2G and 3G Mobile Data . if signal strength is low 3G is Preferred .
WCDMA only GSM phone forces only 3G Mobile Data . if 3G signal is too low you get no Signal .
Other GSM Modes :
GSM only GSM phone forces only 2G Mobile Data . if 2G signal is too low you get no Signal .
GSM auto (PRL) GSM phone can use both 2G and 3G data Mobile Data . if signal strength is low 2G is Preferred
Automatic Mode :
GSM/CDMA auto (PRL) - phones equipped with GSM and CDMA .( Not Sure ) phone attempt to stay connected to the Mobile Data type that works the best ( through choosing the CDMA network directly or GSM Roaming networks , not sure ) ??????.
Auto PRL ( Preferred Roaming List ) :
this list should be updated frequently , help connect to 3G ? . to get update ( through *228 or through Dialing ##778 , Then Select Prl then Update . i don't have much Knowledge about the following , But some who change Carrier would download PRL suitable for the New Carrier and replace the existing . through using certain Software ( Powerful Software that Can damage Your phone if you Don't know what you are doing ) , and is that required or Not . for myself i would not do it unless it is a Must.
Hope help testing and adjusting setting for 2g,3G , i myself was confused about some of those setting Especially WCDMA Preferred
You can reach All the above Options through Phone Information menu ( called also testing menu ) by dialing *#*#4636#*#*​I appreciate if you hit thanks Button , if you found this Post useful

trkaaa said:
GSM/CDMA auto (PRL) - phones equipped with GSM and CDMA .( Not Sure ) phone attempt to stay connected to the Mobile Data type that works the best ??????.
Auto PRL ( Preferred Roaming List ) :
this list should be updated frequently , maybe help connect to 3G ?? . to get update ( i think *228 or i think through Dialing ##778 ,Not Sure , Then Select Prl then Update . i don't have much Knowledge about the following , But some who change Carrier would download PRL suitable for the New Carrier and replace the existing . through using certain Software ( Powerful Software that Can damage Your phone if you Don't know what you are doing ) , and is that required or Not . for myself i would not do it unless it is a Must.​Hope help testing and adjusting setting for 2g,3G , i myself was confused about some of those setting Especially WCDMA Preferred
Click to expand...
Click to collapse
While working for Verizon I know that *228 option 2 is the one you select to update just the PRL. When updating the PRL it just ensures your phone has been updated on the network with latest additions to towers and such. Possibly can improve your signal strength in areas where improvements or new towers have been added. This also can help when you travel in extended network where Verizon has a roaming agreement. It is recommended to do so atleast 1 time every 3 months.
Choosing option 1 from the menu is for when you are changing devices(esn's) on your number. This will program the proper MDN and MIN as well as SID into the phone so it can work on your number and the Verizon network. Sometimes doing option 1 can resolve issues with your device as well, but in rare cases.

so there is no way can force the htinc2 to work with h or 3g

m_srayi said:
so there is no way can force the htinc2 to work with h or 3g
Click to expand...
Click to collapse
yes you can force 3G as follows ( All mentioned in my above Post ) :
for CDMA ( if you want to use CDMA network Only )
EvDo only CDMA phone force Only 3G Mobile data. if 3G signal is too low you get no Signal
For GSM ( if you want to use GSM networks only )
WCDMA only GSM phone forces only 3G Mobile Data . if 3G signal is too low you get no Signal .
if you don't want to force 3G only , But make 3G Preferred when Both 2G and 3G are available :
for CDMA ( if you want to use CDMA network Only ) :
CDMA auto (PRL) CDMA phone can use both 2G and 3G Mobile data . if signal strength is low then 2G is favored more.
For GSM ( if you want to use GSM networks only ) :
WCDMA preferred GSM phone can use both 2G and 3G Mobile Data . if signal strength is low 3G is Preferred .
For Both ( Auto ) :
GSM/CDMA auto (PRL) - phone attempt to stay connected to the Mobile Data type that works the best
You can reach All the above Options through Phone Information menu ( called also testing menu ) by dialing *#*#4636#*#*
i guess it works like this but not sure ,
if you choose EvDo onlythe phone will force the connection to Verizon Wireless 3G only , it will not try to use the sim Card to use the roaming GSM networks !!!
if you moved to another GSM carrier ,then you have only GSM ( No CDMA ) , then if you used WCDMA only the phone will only connect to the 3G provided by this Carrier

LTE problem

I live in a place in Southampton in which my service provider works on gsm and lte only. My phone with v20a keeps changing my preferred network type from gsm/wcdma/lte auto to a default (I don't know where this is declared) gsm/wcdma preferred. Any piece of advice on how to change this?
Thank you in anticipation!

Try APM+ (Xposed addon)
It gives you the options to customise the power menu and one of them is a 2G/3G/4G switch

Well..
To be honest there is no point in having a toggle, i just want a solution so that my phone doesn't automatically change back to wcdma from lte after a while...i think its something in the settings

Speed Differences & Non-Sticking of "Preferred Network Type" *#*#4636#*#* and b prop

Speed Differences & Non-Sticking of "Preferred Network Type" *#*#4636#*#* and b prop
When speed testing on the "preferred network type" of LTE/CDMA/UMTS auto (PRL) I get an average speed of 9Mbps. When I change it to "TD-SCDMA only" I get an average of 21Mbps. I would like to keep it as TD-SCDMA but when exiting it always reverts back to LTE/CDMA/UMTS auto (PRL). In the settings on the phone under mobile networks it only allows me to select LTE, 3G, and 2G. When setting it in the build prop under ro.telephony, I have it set to 13 which is "TD-SCDMA only", it does not stick either. LTE/CDMA/UMTS auto (PRL) is the one it always defaults to no matter what. My network Carrier is ATT, the phone is unlocked and rooted. Can anyone offer any solutions?

SM-T807P with not support to WCDMA

I have a SPRINT SM-T807P pre-owned tablet working 100% OK.
The device IMEI is clean and I'm outside the US.
I could find the 2G/3G/4G technology and bands supported prior to buy the device through eBay.
Then, running stock ROM MM 6.0.1 updated > root > unlock and debranding to clean SPRINT apps and restrictions with others carriers SIMs.
I have 3 SIMs from my 3 local carriers and I know I can't use LTE since the carriers LTE bands are not compatible with the device (Band 2 and Band 4 required by the carriers)
www_gsmarena_com/samsung_galaxy_tab_s_10_5_lte-6235.php
No problem with that, I can use 3G/2G mobile data for my internet surfing and email check tasks.
My problem is that my device is not supporting WCDMA!
When I'm in IOTHiddenMenu > ##DATA# Menu > HDR/1X Selection, I have only these options:
1) Hybrid
2) CDMA Only
3) EVDO Only
4) EHRDP 1x
5) Global
6) LTE + CDMA + EVDO
7) LTE only
As you can see there is nothing related to WCDMA!
Using "Global" is not the trick.
In GCF SETTING when going to
[2]UE Setting & Info
[1]Setting
[1]Protocol
[2]NAS
[1]Network Control
[4]BAND SELECTION
I can see "WCDMA Band Preference" > "WCDMA ALL" option but this setting is not saved.
Only are saved the options related to LTE, CDMA or LTE+CDMA.
Same behavior when going to RADIO SETTINGS > Set preferred network type. GSM/WCDMA options present but are not being saved nor accepted. I can save only options with LTE or CDMA (or both) involved.
RTN RESET and NV REBUILD done without getting WCDMA enabled after the tasks.
Now I'm in the way of discover why all the people with SPRINT SM-T807P can enjoy WCDMA services after unlocking the device and I can't do it as expected.
I'm thinking that is a restriction on the stock ROM.
I have a MSM8974 board with a Snapdragon 800 processor.
Build ID MMB29M.T807PVPU1CPI1
Any help/advice to enable WCDMA on the device will be really appreciated.

Additionally, when I'm in RADIO SETTINGS for some reason I can't select some options.
With a (*) mark are my "selectable" options. The other ones can't be assigned...
WCDMA preferred
GSM only
WCDMA only
GSM auto (PRL)
(*) CDMA auto (PRL)
(*) CDMA only
EvDo only
(*) GSM/CDMA auto (PRL)
(*) LTE/CDMA auto (PRL)
(*) LTE/GSM auto (PRL)
(*) LTE/GSM/CDMA auto (PRL)
(*) LET only
(*) Unknown
All the "selectable" options were tested (selected and restart) with no success...

Maybe I need to enable LTE/HSDPA/GSM required bands through CDMA Tools or it seems to be a bad idea?

Adding additional LTE Bands was not possible with CDMA tools.
The new selection is not being saved.
I'm in the way of flashing the stock SM-T807T (T-Mobile) on my SM-T807P (Sprint) to check the behaviors.
Any advice will be really appreciated...

I could see at the Qualcomm website that the Snapdragon 800 processor supports WCDMA and full LTE bands frecuencies:
Supported Cellular Technologies
LTE FDD
LTE TDD
LTE Broadcast
WCDMA (DC-HSDPA, DC-HSUPA)
TD-SCDMA
CDMA 1x
EV-DO
GSM/EDGE
https://www.qualcomm.com/products/snapdragon/processors/800
I'm in the way (too) of searching for the correct MODEM flash file to get LTE, WCDA and GM/EDGE fully unlocked and working...

It was not possible to flash SM-T807T (T-Mobile) stock ROM from SAMMobile on SM-T807P (Sprint)
There is a Odin error.
I will try by editing NV to get the bands working...

Well, after working with CDMA Tools, NV Manager and editing the build.prop file, now I can see my required LTE, WCDMA and GSM additional bands! No more "Searching network connection" on the top left corner.
But the signal icon on the top right corner is always empty (no signal at all).
I have checked, deleted and reconfigured the APN, with no success.
And still I can't set "GSM auto (PRL)" on the Service Mode as "Preferred Network Type" so I believe I'm missing something else.
I'm really exhausted, I need help to be able to get my Samsung Galaxy Tab S working OK on my local GSM networks.
I will open a new thread offering to pay/donate for the service to have my device working on GSM ...