Dual Sims keep losing signal - OnePlus 7 Pro Questions & Answers

I have a dual sim setup, one on Telstra and one on Vodafone. At random intervals and probably at least 5 or 6 times an hour both Sims will disconnect...the signal icons show no signal. After a few seconds the signal returns to full strength....I'm sure this has only started happening since upgrading to 10 but I can't swear to it.
Does anyone have any ideas?
Cheers

So I found the solution. My company has recently mandated work profiles and uses VMware MDM.. The dropping has been ever since I installed this. Uninstalled and got rid of the work profile and now it's working again....

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[Q] complete signal loss

Iv had the AT&T One X since the 4th and so far I love it! I haven't had any wifi issues or bootloops or anything, the only problem I'm having is the phone will randomly lose signal completely (0 bars, little x next to the signal) and wont get it back unless I put it into airplane mode and turn it back off, or reboot the phone. In the 6 days Iv had it it's lost signal 3 times, once on the road where I normally get at least 3-4 bars, and the other 2 happened at some point over night while I was asleep. Has anyone else been having this problem? Also do you think it's a software/radio problem that can be fixed in a update, or would it be hardware in which case I should take it to the store and exchange for a new one.
I've had this problem myself. Had the phone for 19 days now and I think it's happened to me 3 or 4 times.
I can guarantee it's fixable with a software update, even if the problem is hardware-related. At the very least, the software could detect the lack of signal and automatically cycle in and out of airplane mode to fix the problem without user interaction. But I'm sure whatever fix we get will be much more reliable than that.
WHEN we get the fix is another question...
Thanks for the reply. I figured it might be a software issue since you can cycle airplane mode and get it back and I don't really want to take it down to the AT&T store for an exchange in fear I wined up not able to set up gvoice or start getting wifi issues and the like lol. so far the signal drops are far and few in between making it an annoying issue rather than a critical one, and I read we've got root now so even if HTC/AT&T twiddle their thumbs and pretend nothings wrong I'm sure the community can save the day lol
I would swap it out Azure. My first HOX did exactly this, and I saw it reported elsewhere on a number of other devices. To me that says it's most likely a bad radio flash on some handsets. I suppose you could try and flash the RUU that was posted, as it most likely includes the radio as well.
I got tired of all my calls going directly to VM without ringing. And not being able to send out texts. My replacement works much better (or rather, how it should've from the beginning).
agentdr8 said:
I got tired of all my calls going directly to VM without ringing. And not being able to send out texts.
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Click to collapse
Was this problem intermittent?
My phone has been doing this randomly, except it never went to voicemails, just hung up after like 30 seconds.
Wondering if I should switch it out also.
Had this problem for a day. Took my phone to the at&t store and they changed out the sim card and I haven't had a problem since.
Sent from my HTC One X using XDA
usfslacker said:
Had this problem for a day. Took my phone to the at&t store and they changed out the sim card and I haven't had a problem since.
Sent from my HTC One X using XDA
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Click to collapse
I never thought about the sim card being a possible problem...might run up to the store when I get the chance and swap my sim out and see if that fixes it, if not I'll just swap the device out and hope all's well
The CSR actually swapped a new micro sim first, since the one provided via online sales was an older one (most likely from the iphone 4/4s batch). It didn't seem to fix the problem though.
And yeah, the problem was very intermittent. One second it would be working fine, and the next it would show the "x". Sometimes the bars would come back immediately, other times it wouldn't until I rebooted or cycled airplane mode. Luckily it happened while I was at the store; it's much easier to convince a sales rep to swap a phone when they can witness the issue(s).
Yeah it's only happened to me twice since I got it on the 4th... it'll be very hard for me to convince them that there's an issue haha... maybe I'll head down there if it happens at a time when I'm not in class or something. I'm sure if I mention returning it/their policy I'll get a swap.
agentdr8 said:
The CSR actually swapped a new micro sim first, since the one provided via online sales was an older one (most likely from the iphone 4/4s batch). It didn't seem to fix the problem though.
And yeah, the problem was very intermittent. One second it would be working fine, and the next it would show the "x". Sometimes the bars would come back immediately, other times it wouldn't until I rebooted or cycled airplane mode. Luckily it happened while I was at the store; it's much easier to convince a sales rep to swap a phone when they can witness the issue(s).
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Click to collapse
next time my phone drops signal I'll take it into the store and see about a sim swap in hopes that'll fix the issue if not then I'll reluctantly swap the unit out (I've grown rather attached to this one xD)
**EDIT**
strange...woke up today and my phone completely lost signal again, normally there's a few days between each event but this is the first time it's happened twice in a row =\
So it happened again, I'm going to go get it switched... but it says on the Mobile network section of settings, "Disconnected because service is unavailable."
There is clearly almost full signal strength, and I have never been without service where I live.
I was expereincing constant network drops all of yesterday due to an outage. However, it's back to normal for me today. So it may be possible there's an outage near you as well.
I think it is more AT&T than your phone. I was in down town buffalo at a swim meet with 5 bars of hspa+ on my blackberry bold that has a great radio. I had data but it was slow dial up slow. There were maybe 100-200 people at the meet and it was at a community college. The only other time I had this was when I was in a car that was driving by the buffalo bills stadium. Voice worked but I had no data. I guess too many people using their cell phones.
Definitely not AT&T, my SE Xperia x10 worked perfectly fine, never had any trouble with signals.
I also encounter the intermittent signal drops on my 4 days old AT&T one x.
It seems to me that the One x doesn't hold signal as good as the iphone, my 4 and 4s usually get around 2 bars in some really remote locations of the building I work. But the One X just drops signal completely. I'll see if I can do a sim swap like some others suggested.
I'm starting to think it could be an issue with lte phones because the same thing was happening to me on my galaxy note with 2 different sim cards and 2 different devices and now it's happening on my hox
Sent from my HTC One X using Tapatalk 2
it has happened to me 3 times in 5 days. All 3 times I was either:
1. in a poor reception area and it came back on its own, i did not have to use airplane mode.
2. was using BT streaming in car and using car charger, once car charger was unplugged, signal came back.
One X has issues
Definitively problems with the phone.
I have three.
They just drop signal completely. One will work, the other will not. Only way the signal will come back is if you turn the phone on and off again. I love everything about this phone....except it isn't a very good phone.
Also, typically when I turn the phone back on, that is when I get my text messages. Nice.
Yeah I figured out it happens when I lose signal (a couple buildings on my schools campus don't get reception), and then the signal won't come back until I reboot or airplane mode.. this is after a sim swap.
Oh and do I need the box my phone came in to swap it?
Sent from my HTC One X using XDA
I have had this issue as well being on the Rogers (Canada) network. I started a thread as well and my theory is there may be a hardware issue reading the SIM cards.
Every now and then I get a "preparing SIM" message pop up on my screen. Also, I lost signal once and in frustration I slapped the phone into my palm VOILA! signal came back full.
This is the second One-X I've gotten from Rogers so there may be a design flaw somewhere. The problem is this behavior only pops up intermittently and cannot be recreated at will. This makes troubleshooting very difficult and practically unprovable in the eyes of providers.
Hopefully there are more reports of this problem and the carriers push back on HTC to resolve the problem.

[Q] Signal problem

Hi
My girlfriend also owns a oneplus one. She had the screen repaired, since then she doesn't have signal all the time. Sometimes it works, sometimes it doesn't. She tried to fix it with another sim but no effect. But last week we went abroad twice and when we were abroad she had signal all the time, and as soon as we got back in Belgium she lost signal again. Now since a day or 2 she has even less signal and she can't send messages or call even with signal.
Just adding that I also own a oneplus and I use the same provider and I have signal everywhere and I have no issues at all.
Anybody that has a solution or might know what the problem is?
Thanks in advance
Anthony

Cellular Signal Constantly drops to no bars - UK - giffgaff SIM installed

Hi fellow Honor8 owners,
I have UK Honor 8 32GB model purchased from Vmall.eu/uk. I came from an iPhone 5S and must say I'm loving the device!
Only issue I have been having is constantly, the Data signal keeps dropping out and I am unable to recieve/send calls and texts. It completely drops out for a bit then comes back. This happens very often.
Is anyone else experiencing any similar issues? I have the nano SIM installed into SIM slot 1 .
I will maybe give the SIM a clean and reseat it into tray to see if there is any difference.
otherwise aside from that issue it's been amazing! One thing I'm really impressed is with battery, I am getting like 6 Hours Screen On Time on each cycle! and I'm not such a light user. Great for £260 unlocked!!
:good:
I also have giffgaff. This also happens to me mostly at home. I disabled Carrier Aggregation which seems to help, but it still happens sometimes.
I have the same and set the signal to be 2g only while at home, as I am using home wifi. I get many more bars when I do that and its good for calls and text only of course.
Its a pity we are not able to activity switch mobile data modes depending on our location without rooting.
scoobydu said:
I have the same and set the signal to be 2g only while at home, as I am using home wifi. I get many more bars when I do that and its good for calls and text only of course.
Its a pity we are not able to activity switch mobile data modes depending on our location without rooting.
Click to expand...
Click to collapse
So I tried cleaning and blowing in sim slot maybe debri but no still had the same issue. But then changed to carrier aggregation off, that helped a bit but still had issue often.
Finally resorted to switching to 2G for Calls and SMS only and I am mainly getting full signal strength all the time!
strange.. wonder if it is hardware issue or can be fixed via update?

Very Strange LTE issue

To Those Who Know More Than Me (that's pretty much all of you),
I purchased an unlocked H830 to use on Cricket Wireless (and hopefully root, but that's another story). When I first popped in the Cricket SIM, it found cellular signal as well as data within a minute or two. All was well, it seemed.
But this weekend, a couple of days later, data began to not work in Chrome, Maps, the Google feed, ESPN app, etc. Here's the weird part: the signal indicator shows 3, 4, even 5 bars and 4G active. Speedtesting shows I'm getting 2-3 MBps--not great, but not unusual on Cricket. So why does the phone pull internet but not distribute it to the apps trying to use it? Maybe 20% of the time, data will work, but that's obviously not enough for a small business owner like myself who is out and about constantly. Calls and SMS work just fine, so I don't think it's a corrupted/damaged SIM card.
I have deleted and reset the APN a couple of times. I have restarted the phone. It is running H83020a, since I manually downgraded from c in order to try and root. Strangely, it now says no new update is found--are those locked to the T-Mobile network?
Does anyone have a solution to this? I'm quite frustrated. Everything else about the G5 (barring the complicated root process) is working fine, and I want this to be my daily driver once the data issue is resolved. Thanks!

Wildly intermittent data connection

Starting about two weeks ago my phone started dropping 4G signal down to 3g with no apparent reason. This is in the same locations that I've been in multiple times in the past and had excellent connectivity. To make it more interesting, my wife has the exact same phone purchased on the exact same date. standing next to her she will be on 4g and I will be on 3G. This is on the Verizon service. So far I have been to Verizon and replace the SIM card. Reset data connection. And done a factory reset. If I cycle the airplane mode four five times in a row many times but not always it will restore 4G service. Any guesses at all?
Open 'About Phone' under settings on both phones and compare various versions. One may have received a new update before the other.
Ever since the March retail update my signal indicator seems to constantly bounce from Edge to H, H+ and LTE(xt1955-5 on TMO). When I am in an area with good reception(I live deep in the sticks), the download rate(1-4 MB/s) does not waiver despite the signal indicator changing every 10 seconds. When reception is known to be sketchy, and it indicates I have LTE, I am still lucky to get 100 KB/s max down.
Is your phone rooted? If so, what ROM are you using?
Some ROMs (and perhaps stock firmware) have an option to choose the preferred network type for your phone to connect to. Perhaps the setting was changed to 3G on your phone.
Replaced
Never did get to find out what the problem was. I was able to get a warranty replacement. Thanks for all the suggestions. I did look into most of them. I think it helped me get the warranty service expedited by saying that I tried all these various things. My wife's phone in mine are on different software versions. However my replacement phone, which I'm presently using, had the same software version that I had problems with before and it's working flawlessly. So it ended well but I still have no idea what happened. Thanks again for all the help and suggestions.

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