Is there anyone who can answer my query. I bought a samsung galaxy note 3 sm n900p from eBay India. Everything is working fine but the main thing calls are not working properly.. The other person can't hear my voice 4 out iof 5 times. Signal getting cut all of a sudden to no service available and in the next second and then again gets the signal. What should I do. I tried factory reset, cache partition wipe and what not but nothing worked. Can anyone help. I like the device like anything. Please help. Device hardware is working wonderful. No problem in it
Hm, how do you know that device hardware work wonderful? I'd rather think the issue is in GSM receiver and go to some service to check it.
Service center people says that it's a foreign model and they won't help me with that
Sent from my SM-N900P using XDA-Developers mobile app
Is there any other way I could verify it I feel compatibility is wrong with frequency bands
Sent from my SM-N900P using XDA-Developers mobile app
Is there any way I could set it to use in india
Sent from my SM-N900P using XDA-Developers mobile app
How to check whether GSM receivers are working fine?
Sent from my SM-N900P using XDA-Developers mobile app
I spoke to a smartphone repairer who has great experience about what I am facing about signal strength. I clearly told him that the best networks are not able to hold the strength and signal strength falling from - 89 dbm from 0 dbm at once and gaining again.
He said this is a problem with sm 900p sprint lte model and it's a bad choice on my part. That I made a mistake by buying it. I asked is there any way I can get it repaired and he said it's not a problem in hardware or software but compatibility in India.
Should I just take his word as final or should try better sources?
Sent from my SM-N900P using XDA-Developers mobile app
I repair cellphones and sell Sprint, ATT, Verizon, and T-Mobile phones in the USA. That being said, I have to know the differences about these networks. For example, ATT, and T-Mobile use something that is called GSM. It's a method of how your phone connects to the network. GSM is used in the majority of world.
Sprint and Verizon on the other hand use a different radio technology called CDMA. It is completely different than GSM. CDMA uses different frequency bands to communicate. They take completely different hardware.
Now where things get really specific and technical, every carrier in the US have to be regulated by our government (the FCC). Sprint purchases certain frequency bands from the government to use for their network. While the other companies(ATT &Verizon) have their different frequency bands "purchased" by the FCC.
For example, imagine you had walkie talkies. You can pick any channel you'd like, but they both have be on the same frequencies (channels) to communicate with the other walkie talkie.
Now apply that analogy to smart phones specifically made for Sprint. In the baseband, your processor firmware enables which frequencies are accessible and which are not. So if you have a note 4 for Sprint (CDMA) trying to run on GSM, your phone is not configured to read the GSM frequencies you need for your carrier. There are methods in XDA on how to enable these frequencies receive the bands you need to make your phone work normally, but keep in mind that they are outdated and may not work on your phone depending on your proccessor.
I'm experiencing something similar as well, I unlocked my sprint S5 but can only get 3g because of hardware incompatibility.
Related
Ill be getting my charge tomorrow but I was wondering why a 4g phone needs a sim card to access 4g. I havent researched enough to find out and was wondering if yall can help
Sent from my SCH-I500 using XDA App
mrmidnight said:
Ill be getting my charge tomorrow but I was wondering why a 4g phone needs a sim card to access 4g. I havent researched enough to find out and was wondering if yall can help
Sent from my SCH-I500 using XDA App
Click to expand...
Click to collapse
Because it does?
I guess I'm confused. Do you have a problem with using a SIM card? They actually are a pretty darned good idea in my opinion. Especially if you want to travel overseas with your phone, and buy a local card at the Quickie-Mart.
Found this from a quick Google search.
http://www.gemalto.com/uicc_role/
They introduced SIM cards for LTE, therefore this phone requires one.
Sent from my Droid Charge running Humble 1.42
kvswim said:
They introduced SIM cards for LTE, therefore this phone requires one.
Sent from my Droid Charge running Humble 1.42
Click to expand...
Click to collapse
The OP is wondering WHY it needs a sim card. Stop being such a smart ass.
No I don't have a problem with using a SIM, I was with TMobile for a while and know how useful it is, as a matter of fact when I was in the Navy we had a sim imbedded into our smart card IDs. I appreciate the link, does this also make it a world phone or will is it only used for LTE?
No, this is not a world phone. The SIM is just a spec that is required for LTE
10-4 thanks fellas
Sent from my SCH-I500 using XDA App
While the Charge (or, any other LTE phone) isn't technically a "world phone", it can be if the country you go to supports LTE - at least partially.
The Charge doesn't support VoLTE (Voice over LTE), which requires a special modem chipset. I believe the Revolution does have the VoLTE chipset. If you have an LTE phone with VoLTE, your phone will eventually be a "World Phone" when other countries implement VoLTE.
That said, you may be able to use your LTE phone in an LTE country to make calls using a VoIP application, such SIPDroid.
On the bright side if you switch between 4g phones, you can just plug in your sim card like a GSM phone.
That's what I do to switch between my Tbolt and Charge, none of that x228 stuff. Just plug in my sim and all is well
¿GotJazz? said:
While the Charge (or, any other LTE phone) isn't technically a "world phone", it can be if the country you go to supports LTE - at least partially.
The Charge doesn't support VoLTE (Voice over LTE), which requires a special modem chipset. I believe the Revolution does have the VoLTE chipset. If you have an LTE phone with VoLTE, your phone will eventually be a "World Phone" when other countries implement VoLTE.
That said, you may be able to use your LTE phone in an LTE country to make calls using a VoIP application, such SIPDroid.
Click to expand...
Click to collapse
That's IF the country you are in is using the same LTE bands as the US. Think about it, how many GSM bands does a phone need to support to work for Voice and Data in every country?
GSM and CDMA are forks of the same technology.
Way back when things split, the CDMA-based carriers (at the time AirTouch, and Sprint) decided that (partially in order to keep carrier lock-in) it would be better to include everything needed for connection to the network within the body of the phone. Essentially, CDMA phones have the SIM integrated into the SOC.
In comes LTE, which Verizon decided on as their 3.9G technology, but also happens to be SIM-based and doesn't support the integration with the SOC like CDMA.
If you look closely, the primary technology behind GSM networks is actually called WCDMA.
LTE must dictate that the SIM be removable then because it could easily be integrated. Otherwise 4G looks like an afterthought.
Hello...
I've been searching for a while now and can't find the answer to a simple question:
Are there differences in the Nexus S sold by AT&T, Sprint and the Unlocked versions you can purchase online? Basically, I'm asking if the Unlocked Nexus S online, which has a GSM card, can be used on the Sprint network.
We have a Google Nexus S here at work for NFC testing. It currently has an AT&T SIM card in it. But, I see it has an IMEI number under the battery.
Can I take this IMEI number and register it on Sprint?!?!
Or, are there special CDMA models sold with no GSM sockets?
Thank you!
No you can't use att or tmobile phones on sprint networks. They are a different technology. Sprint and verizon are cdma networks which don't use SIM cards where as tmobile and at are GSM networks which use sim cards. They operate in different radio frequencies. And even than its unlikely sprint would allow a different networks phone to be used in there network.
Sent from my Nexus S 4G using xda premium
You would think that is the case, yes. CDMA and GSM (which I mentioned in my post as well). I'm very fimiliar with the differences in them.
But, someone at work broke out his Verizon Blackberry (don't know the model number) and shows his IMEI number under the battery. As well as his SIM socket with a Canada SIM card in it. "I use this carrier in Canada as they are cheap roaming."
THat's what left me baffled - a phone that was both on the CDMA network, and the GSM network in other countries.
Also, your post sounds like you are just guessing - since they are known different technologies. Do you know for a fact that the phone does not have both a CDMA radio, as well as the GSM radios (yep, two with them). THere are Japanese and Europe phones that has the combinations in a single phone, running Android.
Yes he is sure.
World phone by blackberry? Lol
Sent From In between Your Moms Boobies
Some phones can do both. Nexus S cannot.
Sent from my Nexus S using XDA App
Ok, so I've searched all over and haven't had much luck. I have no experience with cdma phones, as t mobile is all I've ever had.
I was given a new US Cellular HTC Hero s. I opened it up and saw the sim slot and though, sweet I can replace my sensation with it (I smashed the screen pretty bad). Well, that was a no go, as the phone is cdma. Looking online though, I see it can run in gsm (options global mode, cdma mode, gsm / umts mode. I unlocked the bootloader using the htc site (not sure it matters) and popped in my sim card again, and tried both global and gsm mode, though neither got signal or would dial out. (under networks, it had the tmo apn info.)
So, is the GSM mode offered on this phone only for non US bands? Would a custom rom (now or down the road) allow it to work on tmo? I read something about the HTC Merge and someone being able to switch out the modem in the rom that allowed it to work in the US, but that is well beyond me. I can follow instructions, work ADB and flash roms.. but thats about it.
Is it possible, or will it soon be, to have this phone work on GSM or am I just stuck trying to sell it as a us cellular phone (or perhaps another cdma carrier.. like I said, I don't know anything about cdma)
As a Canadian I'm not sure about who owns US cellular or if they are their own company but I'm guessing they work like Verizon world phones. They have sim card slots but will work only outside of the US. If those verizon phones are used within the States, they will only pick up Verizon's frequency, as opposed to T-Mobile or AT&T where you can unlock them and use them with any GSM carrier within the States. But yeah, you can unlock it and it will work with any GSM carrier outside the States but within the States I think it will only work under US Cellular CDMA network...please correct me if I'm wrong.
That's right, u.s. cdma "world phones" have gsm radios but are locked down from connecting to gsm networks in the u.s. This is not just the normal sim lock found on gsm phones but they are hard coded to ignore u.s. gsm networks.
Some have been unlocked to work on any network through various methods including flashing a modem from a non-us varient of the same phone and other hacks. I can't comment specifically on this phone however.
Sent from my SPH-D700 using XDA App
Well, that points me in the right direction, and confirms what I read about swapping modems (on the other phone mentioned).
So basically it's software telling it not use a certain frequency, and not that the phone itself is incapable of picking it up (had my doubts about that)
Pretty shady the way phone companies are allowed to operate (don't get me started on my unlimited internet in my contract [pre data caps in tmo]. "Hey! check it out, this phone uses data 5 times faster than your old one, oh, and you get half as much too) sorry, end of rant.
I'll keep searching, and post if I find something..
On a side note, can cdma phones be flashed to another cdma carrier like verizon or sprint, or is it the same deal, coded to only use a certain frequency range?
only thing I've heard of is flashing sprint and verizon phones to cricket, metro pcs and boost.
Hello,
I have been using the Simple Mobile $70 plan for unlimited 4G data. Since I got my brand new Nexus 5, I was wondering why I am not getting "LTE" icon on the notification bar. It only shows H/3G which means (I think) HSPDA+. This is weird since the APN is set to T-mobile LTE (fast.t-mobile.com). Can I fix this if I change the service provider to, for example, T-mobile (assuming Simple Mobile 4G is not LTE)? I heard some people are getting LTE icon with Straight Talk and some don't.
Thanks for your advice in advance!
I went to dialer *#*#4636#*#* ,phone information and select network to GSM/ LTE(auto)
Sent from my Nexus 5 using xda app-developers app
eagle_j said:
I went to dialer *#*#4636#*#* ,phone information and select network to GSM/ LTE(auto)
Sent from my Nexus 5 using xda app-developers app
Click to expand...
Click to collapse
It's already set to LTE/GSM auto (PRL). Any suggestions??
ericjslee said:
Hello,
I have been using the Simple Mobile $70 plan for unlimited 4G data. Since I got my brand new Nexus 5, I was wondering why I am not getting "LTE" icon on the notification bar. It only shows H/3G which means (I think) HSPDA+. This is weird since the APN is set to T-mobile LTE (fast.t-mobile.com). Can I fix this if I change the service provider to, for example, T-mobile (assuming Simple Mobile 4G is not LTE)? I heard some people are getting LTE icon with Straight Talk and some don't.
Thanks for your advice in advance!
Click to expand...
Click to collapse
it depends on if u have LTE service in the area you are at. For instance, I only get 3g service at my house , but if i go a block west of my house i get LTE service. Also i have noted that the nexus 5 have weak reception, some spots i can browse and make calls with my Iphone but at the same spot nexus 5 has no service.
And dont trust the T-mobile coverage map, its a bunch of BS. There are so many areas that I know of that have no service at all of any kind and are shown as great service areas on the map. Best way to find out coverage is to just go to different places ( indoors and outdoors ) and test it out.
fruitsalt said:
it depends on if u have LTE service in the area you are at. For instance, I only get 3g service at my house , but if i go a block west of my house i get LTE service. Also i have noted that the nexus 5 have weak reception, some spots i can browse and make calls with my Iphone but at the same spot nexus 5 has no service.
And dont trust the T-mobile coverage map, its a bunch of BS. There are so many areas that I know of that have no service at all of any kind and are shown as great service areas on the map. Best way to find out coverage is to just go to different places ( indoors and outdoors ) and test it out.
Click to expand...
Click to collapse
You are right. The problem is it doesn't work in my house as well as on campus and in any Chicago downtown area. Maybe I need to try another provider? But buying a new sim card, porting, and changing provider are time- and money-wasting.
ericjslee said:
You are right. The problem is it doesn't work in my house as well as on campus and in any Chicago downtown area. Maybe I need to try another provider? But buying a new sim card, porting, and changing provider are time- and money-wasting.
Click to expand...
Click to collapse
You should try using an att sim and see what kind of coverage you get. Att is definitely more expensive than t-mobile and you dont get unlimited data no matter what but i see no point of having and paying for a service which you can not use. Also you can ask someone else who has the nexus 5 and t-mobile how the coverage is for them in and around the areas you frequent, it might be a device issue.
fruitsalt said:
You should try using an att sim and see what kind of coverage you get. Att is definitely more expensive than t-mobile and you dont get unlimited data no matter what but i see no point of having and paying for a service which you can not use. Also you can ask someone else who has the nexus 5 and t-mobile how the coverage is for them in and around the areas you frequent, it might be a device issue.
Click to expand...
Click to collapse
My friend just told me the processor might not be compatible with the bandwidth that simple mobile uses. I also read some articles saying that LTE support is somewhat perplexing (http://www.extremetech.com/extreme/170166-nexus-5-excellent-global-coverage-perplexing-lte-support),
and that AT&T is fully compatible (http://www.androidpolice.com/2013/1...y-compatible-with-atts-lte-and-hspa-networks/). Your N5 is working fine with AT&T, right?
ericjslee said:
My friend just told me the processor might not be compatible with the bandwidth that simple mobile uses. I also read some articles saying that LTE support is somewhat perplexing (http://www.extremetech.com/extreme/170166-nexus-5-excellent-global-coverage-perplexing-lte-support),
and that AT&T is fully compatible (http://www.androidpolice.com/2013/1...y-compatible-with-atts-lte-and-hspa-networks/). Your N5 is working fine with AT&T, right?
Click to expand...
Click to collapse
Nope. Simple Mobile is an MVNO that operates on T-Mobile's network. The nexus 5 supports all the bands that T-Mobile broadcasts on.
Does Simple Mobile even offer LTE? Because according their website they do not, but they offer hspa+. Which is kind of considered 4g speeds. No mention of LTE.
Sent from my Nexus 5 using XDA Premium 4 mobile app
ericjslee said:
My friend just told me the processor might not be compatible with the bandwidth that simple mobile uses. I also read some articles saying that LTE support is somewhat perplexing (http://www.extremetech.com/extreme/170166-nexus-5-excellent-global-coverage-perplexing-lte-support),
and that AT&T is fully compatible (http://www.androidpolice.com/2013/1...y-compatible-with-atts-lte-and-hspa-networks/). Your N5 is working fine with AT&T, right?
Click to expand...
Click to collapse
I dont see the connection between the processor and bandwidth. I have no idea what bands simple mobile uses but thats based on the radio of the device. As far as i know Nexus 5 supports 3g/4g(h)/LTE for tmobile and att, never used sprint so cant say.
Yes i got my phone from T-mobile and i just put my work att sim card into it, all that was needed was a reboot and it automatically picked up att service with LTE. Data speeds are great, getting 8+ Mbps with only 2 bars of service.
I do think that the nexus 5 have reception issues, the same att sim card in an htc one or iphone 5 gives minimum 4 bars but data speeds are around the same (+ 2~3 Mbps) but more consistent. With t-mobile, i was missing calls, receiving texts hours later and the phone was just hopping between LTE, H and No service.
brooksyx said:
Well that is incorrect. Simple Mobile is an MVNO that sells plans on T-Mobile. The nexus 5 is a world phone and supports all the bands that T-Mobile broadcasts on.
Does Simple Mobile even offer LTE? Because according their website they do not, but they offer hspa+. Which is kind of considered 4g speeds. No mention of LTE.
Sent from my Nexus 5 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Yes, I remember OOKLA test once peaked 14Mbps, so it's not just 3G. After some research, I found that Nexus 5 works with LTE bands 1/2/4/5/17/19/25/26/41 while T-mobile uses 4 only, Verizon uses 4/12, AT&T uses 2/4/17/29/30, and Sprint uses 25/26/41. Is it a good idea to change the provider to AT&T, or Sprint? Do they support porting in most cases? Thanks.
fruitsalt said:
I dont see the connection between the processor and bandwidth. I have no idea what bands simple mobile uses but thats based on the radio of the device. As far as i know Nexus 5 supports 3g/4g(h)/LTE for tmobile and att, never used sprint so cant say.
Click to expand...
Click to collapse
Actually there is a direct connection between the CPU and the bandwidth support because the radio is part of the snap dragon 800 'system on a chip' CPU.
http://en.m.wikipedia.org/wiki/Snapdragon_(system_on_chip)
Sent from my Nexus 5 using XDA Premium 4 mobile app
---------- Post added at 11:17 AM ---------- Previous post was at 11:16 AM ----------
ericjslee said:
Yes, I remember OOKLA test once peaked 14Mbps, so it's not just 3G. After some research, I found that Nexus 5 works with LTE bands 1/2/4/5/17/19/25/26/41 while T-mobile uses 4 only, Verizon uses 4/12, AT&T uses 2/4/17/29/30, and Sprint uses 25/26/41. Is it a good idea to change the provider to AT&T, or Sprint? Do they support porting in most cases? Thanks.
Click to expand...
Click to collapse
I would suggest straight talk if you want LTE that. $45 a month. Order their At&t based Sim.
Sent from my Nexus 5 using XDA Premium 4 mobile app
brooksyx said:
Actually there is a direct connection between the CPU and the bandwidth support because the radio is part of the snap dragon 800 'system on a chip' CPU.
http://en.m.wikipedia.org/wiki/Snapdragon_(system_on_chip)
Click to expand...
Click to collapse
I never really looked into the SOC on the snap dragon, the radio modem being on the die with the CPU would definitely effect the throughput. Thanks for the link, I have some further researching to do
brooksyx said:
I would suggest straight talk if you want LTE that. $45 a month. Order their At&t based Sim.
Sent from my Nexus 5 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
You mean the one they call AT&T Compatible Micro SIM Card, right?
ericjslee said:
You mean the one they call AT&T Compatible Micro SIM Card, right?
Click to expand...
Click to collapse
Yup. That's the one.
Sent from my Nexus 5 using XDA Premium 4 mobile app
Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
UltimateX29 said:
Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
Click to expand...
Click to collapse
We all r out of luck until we get out of this goddamned place
UltimateX29 said:
Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
Click to expand...
Click to collapse
This is the main issue of CDMA companies with mobile phones. In the previous week I went for a tour out of the CDMA range and due to out of the range I haven't even open my website on phone to check it progress because of the net issue. When you switch from one mode to another so it stop even opening browsers.
UltimateX29 said:
Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
Click to expand...
Click to collapse
The CDMA technology approximately dead because the US Carriers which introduced it transfer its towers to a new LTE technology and uses VoLTE for voice calls.
In Yemen the situation is different because the company (Yemen Mobile) hasn't upgraded its equipment since CDMA/EVDO first days, and now the company want to be the first to introduce LTE services but it fails until now because the compatibility and their towers does not configured with right settings.
I have Galaxy S20 FE 5G from US cellular, I inserted a 4G sim to it, it's either works in CDMA or LTE modes.
can't work at the same time.
I tried to play with some settings in DFS but I finished with neither LTE data nor CDMA signal.
but luckily I restored EFS2 and now working either CDMA or LTE.
There is another carrier (GSM based) in Yemen called (YOU) just add the Access point to the phone and it will work immediately.