LG G3 AT&T D850 SiGNAL RECEPTION ISSUES - General Questions and Answers

Hello everyone! I've bought a used LG G3 D850 AT&T version. The problem is that whenever I'm inside any building or where the signal reception is low, the phone would simply give the "Emergency Calls only" notification. I've checked my sim card, my mobile network settings etc. but to no avail. Often when somebody tries to call at my number the operator says the dialed number is powered off whereas I'm getting full signal! This is so frustrating, I'd be glad if someone can help me here!

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[Q] Canadian Koodo Nexus S - Not compatible with UK 3 Sim

Hi,
Recently got a Koodo GTi9020A and have tried to use it in the UK with a 3 Sim.
The phone gets a full 3G signal, data and internet work, however there is a problem with making calls when using the 3G signal.
When the phone is turned on I can make one call to a landline, however if I hang up and dial again there is silence. Calls to other mobiles are scrambled.
I have spoken to Google and have been told that the Canadian software will not work with a UK Sim and the phone will need flashed with UK software.
The phone is therefore 'locked' to the Canadian networks. The lady from Google mentioned that a fully unlocked phone would be more expensive!
Any advice appreciated.
Thanks.

[Q] 3g connection

i have lg optimus 3d from 1 year. when my phone is connecting to 3g is disabled the signal and i can't send or receive any call. and i am try a lot of roms and sim. the problem lies in the hardware. anybody can help me how can i fix my phone.

[Q] Nexus S on MetroPCS GSM Network

Issue is resolved. MetroPCS ties SIM to device. $15 to switch devices.
I recently purchased a Nexus S from Swappa as an emergency replacement phone for a defective Galaxy Nexus.
swappa com /listing/NDY352/view​
I tested it briefly with stock ROM it shipped with and a microSIM in an area with terrible cell coverage, so I thought little of the problems I saw. When I tested it later with CyanogenMod, a full-sized SIM, in an area with strong signal, the problems seem to persist. The solutions I've seen online focus on the Nexus S 4G being flashed onto MetroPCS' old Sprint network, making it difficult to find a solution.
As stated in the Swappa listing above, this is an unlocked T-Mobile Nexus S. It shipped with the box and documentation. The documentation includes T-Mobile inserts. Evidence to me that it is unlocked is that it displays the MetroPCS phone number, it has no T-Mobile branding, and its bootloader was unlockable.
Here are some more technical details:
Settings > System > About Phone > Status > Network, reads, "Unknown"
"""""""""""""""""""""""""""""""""""""""""""""> Service state, reads, "Out of Service."
"""""""""""""""""""""""""""""""""""""""""""""> Mobile network state, reads, "Disconnected"
"""""""""""""""""""""""""""""""""""""""""""""> My phone number, shows phone number, so phone is reading the SIM.
Wireless & Networks > More... > Mobile Networks > Network Operators, when I manually choose MetroPCS, a message pops up reading, "Can't connect to this network right now. Try again later" even though I am in a place that has a strong signal. Another option is available to choose AT&T, and the same error message shows.
Wireless & Networks > More... > Mobile Networks > Access Point Names, MetroPCS LTE is chosen, but no 3G or E icon has appeared next to the signal strength.​
I really thought CyanogenMod would save the day here since it worked flawlessly on the GNex. How can I get the Nexus S to work on MetroPCS' GSM network? By taking it to a MetroPCS store.

No data While on Phone Call!

I have bought the Galaxy S6 G920F, and noticed that while I am on a phone call, I cant use the mobile data, it shows that it is connected to H+ but no data is sent or received.
My carrier is on GSM network not CDMA, on my previous phone , the LG G4 I was able to use the data network while I am in a phone call!
any suggestions or solutions?
Thats because SAMSUNG in their infinite wisdom , have removed the Dual Antenna from this model.
So you cant have Data AND voice at the same time.
Dumb as ****.
https://www.youtube.com/watch?v=PL4HTYVrgko
Works fine on my phone, I even had 4G voice a few times so it didn't drop to 3g speeds during the call meaning I could make use of 4G during a call.

Invalid sim when network chnged to lte/cdm

I got a sprint s6 unlocked. Stays on global. Been noticing horrible signal here lately. So i tried switching to lte cdma. Here the weird thing. > can send texts get them. Have lte data great sig. But when i make a call it disconect and says invalid sim in a toast and goes away. Never loses sig or noth swap it to cdma or global no prob.

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