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[Q] help with spontaneously unrecognized SIM card

Ok, I'm going to give you guys the whole background story just to cover all the bases.
I've had a Nexus S for about 6 months, never had a hitch. Rooted it, etc etc all fine and dandy.
About two weeks ago, I updated it to CM 7.1 RC1. So far so good.
I've always had the same Vodafone SIM card, which has accompanied me through a couple of phones. Last week, I went to London and bought a UK pay as you go card, to use data without roaming. Perfect. No problems whatsoever.
So, to make it clear, I never had problems with my original (portuguese) SIM card, nor with the british one I had just bought.
However, it was upon my return that I realized I had forgotten my SIM card at my friend's house. I quickly stopped by the Vodafone store at the airport, where they promptly gave me a new SIM, ready to use within a couple of hours.
Since then, my phone after a short period of being on, spontaneously fails to detect the SIM card/no longer recognizes it. I've tried scanning for networks in the settings, but it won't let me register again. It takes a reboot to get it working. Thing is after a couple of minutes or hours, it happens again.
I have since exchanged the new SIM card with a newer one , also from Vodafone, albeit a different store. Yet, the problem persists.
I didn't alter any settings between Portugal-UK-Portugal, so everything should be exactly the same. Does anyone know how to solve this or why this happens?
Faulty phone?
Faulty radio?
Faulty SIM cards?
ROM bug?
Any help is appreciated.

[FIX] One possible solution to your data dropping issues.

What's up guys, don't post much, so excuse if this is in wrong section or whatever. Just thought I'd post my solution for constant data dropping problem I was having. Where for one, I would only have a data connection for no more than 30 minutes before it would stop downloading/receiving any data. And then I'd have to turn mobile network off and then back on again. It also affected phones calls. Where once the data dropped and I tried to make a call it wouldn't connect at all. Nor could I receive calls without first turning off and back on mobile network, or airplane mode. In rare occasions it wouldn't even send texts. The worst part was that even when I had a data connection for whatever amount of time, I got 4g lte absolutely nowhere.
After extreme amounts of frustration, and 100's of reflashes, (not really) I came across a few forum post where users were experiencing the same issue. Some with root and some without. After further reading, some users posted that after contacting HTC, they recommended it be a sim card issue, as early micro Sims have shown to have some defects. And then that's what made me think. Sim card, maybe it's more simple than we think.
Thinking about how many times I dropped the fu*k out of my phone, I thought to grab my sim card removal tool and pop it out.
I noticed that with the sim card holder, the sim doesn't sit very snug in the slot, so given the thousands of times I've dropped this thing, it's likely that the sim card wasn't sitting in that "perfect spot". So I went ahead and blew in the card slot like a 90's game console, (cause that fixes everything) reseated the sim in the holder, and put it back in. And wala. 4g let speeds EVERYWHERE I go now, and not a single data drop for two days. Even when it's switching towers.
Now I no longer want to blow up AT&T
Because our phones don't have expandable memory, and an internal battery , we don't find ourselves having to open it, or constantly remove anything from it. Unless you have multiple carriers in which you switch between Sims with. But most of us contracted HOX users aren't even going to touch that sim slot.
To sum it up, I just hope that anyone that comes across this issue in the same details, and hasnt opened their sim card slot since the day it was activated and put in the phone, will come across this post. Just to give it a try before getting a new sim (as HTC suggests) or getting a different phone manufacturer (as AT&T suggest. -___- )
Thanks to all the devs for the hard work, and for keeping us interested in this ever-changing field.
Later
Sent from my HOX

sighkotic said:
What's up guys, don't post much, so excuse if this is in wrong section or whatever. Just thought I'd post my solution for constant data dropping problem I was having. Where for one, I would only have a data connection for no more than 30 minutes before it would stop downloading/receiving any data. And then I'd have to turn mobile network off and then back on again. It also affected phones calls. Where once the data dropped and I tried to make a call it wouldn't connect at all. Nor could I receive calls without first turning off and back on mobile network, or airplane mode. In rare occasions it wouldn't even send texts. The worst part was that even when I had a data connection for whatever amount of time, I got 4g lte absolutely nowhere.
After extreme amounts of frustration, and 100's of reflashes, (not really) I came across a few forum post where users were experiencing the same issue. Some with root and some without. After further reading, some users posted that after contacting HTC, they recommended it be a sim card issue, as early micro Sims have shown to have some defects. And then that's what made me think. Sim card, maybe it's more simple than we think.
Thinking about how many times I dropped the fu*k out of my phone, I thought to grab my sim card removal tool and pop it out.
I noticed that with the sim card holder, the sim doesn't sit very snug in the slot, so given the thousands of times I've dropped this thing, it's likely that the sim card wasn't sitting in that "perfect spot". So I went ahead and blew in the card slot like a 90's game console, (cause that fixes everything) reseated the sim in the holder, and put it back in. And wala. 4g let speeds EVERYWHERE I go now, and not a single data drop for two days. Even when it's switching towers.
Now I no longer want to blow up AT&T
Because our phones don't have expandable memory, and an internal battery , we don't find ourselves having to open it, or constantly remove anything from it. Unless you have multiple carriers in which you switch between Sims with. But most of us contracted HOX users aren't even going to touch that sim slot.
To sum it up, I just hope that anyone that comes across this issue in the same details, and hasnt opened their sim card slot since the day it was activated and put in the phone, will come across this post. Just to give it a try before getting a new sim (as HTC suggests) or getting a different phone manufacturer (as AT&T suggest. -___- )
Thanks to all the devs for the hard work, and for keeping us interested in this ever-changing field.
Later
Sent from my HOX
Click to expand...
Click to collapse
I haven't dropped my phone, but if I shake it, I hear rattling. Is that the SIM card not sitting in there as tight as it should? I notice if I shake it enough, I'll lose some signal. Another weird thing, I'll get 4G LTE in school, but I walked into the parking lot today and only got 3G, but right now I am getting LTE again

It could be the sim, but it could also be the g sensor. I wouldn't imagine the sim be loose enough to cause a rattling. But who knows. They are micro šims, so the possibility of displacement on the contacts could be a bit more prone, as they have less surface area.
Sent from my HOX

absolutelygrim said:
I haven't dropped my phone, but if I shake it, I hear rattling. Is that the SIM card not sitting in there as tight as it should? I notice if I shake it enough, I'll lose some signal. Another weird thing, I'll get 4G LTE in school, but I walked into the parking lot today and only got 3G, but right now I am getting LTE again
Click to expand...
Click to collapse
It's the camera. Normal.
I have quirky cell coverage areas on at&t too. Same spots with different phones for past 8 years.
Sent from my HTC One X using Tapatalk 2

cfn87 said:
It's the camera. Normal.
I have quirky cell coverage areas on at&t too. Same spots with different phones for past 8 years.
Sent from my HTC One X using Tapatalk 2
Click to expand...
Click to collapse
Ah, makes sense.
Sent from my HTC One XL using Tapatalk 2

My network losses were seriously unbearable. Sometimes I could only be browsing for less than 5 minutes before it dropped. Then it would continue ever five minutes after turning off and back on.
Sent from my HOX

[Q] Water Damage, Everything working fine except no signal

I dropped my new OnePlus in a bucket of water. I immediately to took it out and drained out the water and kept the phone in rice for 2 days.
When I took it out after 2 days all moisture was gone. On switching it on everything works perfectly fine like display, touch, wifi, sound, camera, etc. Only problem is when I insert the sim card though it detects the sim card, i.e. the no sim card sign changes but I am not able to receive any signal.
Please suggest what can be the issue.

abhishek66 said:
I dropped my new OnePlus in a bucket of water. I immediately to took it out and drained out the water and kept the phone in rice for 2 days.
When I took it out after 2 days all moisture was gone. On switching it on everything works perfectly fine like display, touch, wifi, sound, camera, etc. Only problem is when I insert the sim card though it detects the sim card, i.e. the no sim card sign changes but I am not able to receive any signal.
Please suggest what can be the issue.
Click to expand...
Click to collapse
Hardware repair.
Transmitted via Bacon

abhishek66 said:
I dropped my new OnePlus in a bucket of water. I immediately to took it out and drained out the water and kept the phone in rice for 2 days.
When I took it out after 2 days all moisture was gone. On switching it on everything works perfectly fine like display, touch, wifi, sound, camera, etc. Only problem is when I insert the sim card though it detects the sim card, i.e. the no sim card sign changes but I am not able to receive any signal.
Please suggest what can be the issue.
Click to expand...
Click to collapse
The exact thing happened to me. Seems that the sim card slot oxidized and to replace sim slot was not guaranteed that would work. It wasn´t a OPO but a Nexus 5. Fortunately for me Amazon refunded the full price of phone. I told them it just stopped receiving cell signal, since everything else on phone was working...
Switched to OPO and did not regret one iota.

Just a thought, Im don't really know a lot about it but if the sim card is detected but there is no signal maybe flashing the modem again would solve this.
Again it is just a thought and i don't know a lot about it.

Note 20 Ultra exynos UK version stuck in HDPSA (H/H+) with no signal

This happened very often, when mobile signal is weak the phone will stuck in HDPSA (H/H+) with no internet and finally lose its entire signal, even later moved to a better signal area. I have missed a lot phone calls / messages when this happens, have 3 different brand new Note 20 ultra replaced by warranty all have this problem. Can confirm this is not network or SIM card related as when swap the SIM back to Note 10 plus it is just working fine as it should be (3 days while waiting for replacement using the same SIM living in the same area). Put the phone into flight mode and turn it back can solve the problem however the difficult thing is you won't know when this will happen and for the price tag, it seems it should be this kind of problem with it.
This issue seems also with S20 release too, for years the issue is still there, anyone have the same issue or can help?
https://eu.community.samsung.com/t5...9_1602387363_c3023d20e4ec11542a67d3cd7a813fdc

shvyue said:
This happened very often, when mobile signal is weak the phone will stuck in HDPSA (H/H+) with no internet and finally lose its entire signal, even later moved to a better signal area. I have missed a lot phone calls / messages when this happens, have 3 different brand new Note 20 ultra replaced by warranty all have this problem. Can confirm this is not network or SIM card related as when swap the SIM back to Note 10 plus it is just working fine as it should be (3 days while waiting for replacement using the same SIM living in the same area). Put the phone into flight mode and turn it back can solve the problem however the difficult thing is you won't know when this will happen and for the price tag, it seems it should be this kind of problem with it.
This issue seems also with S20 release too, for years the issue is still there, anyone have the same issue or can help?
https://eu.community.samsung.com/t5...9_1602387363_c3023d20e4ec11542a67d3cd7a813fdc
Click to expand...
Click to collapse
See if this helps
https://play.google.com/store/apps/details?id=com.ray.samsungbandselection

*Detection* said:
See if this helps
https://play.google.com/store/apps/details?id=com.ray.samsungbandselection
Click to expand...
Click to collapse
Hi Thanks for the recommendation so dose that mean to use this tool to manually force the phone to stay on a certain type of band? (eg not using HSDPA?) . I was thinking this would be fully automatic as it is a basic function of a mobile phone
I've installed and will give it a try next time the signal is lost.

shvyue said:
Hi Thanks for the recommendation so dose that mean to use this tool to manually force the phone to stay on a certain type of band? (eg not using HSDPA?) . I was thinking this would be fully automatic as it is a basic function of a mobile phone
I've installed and will give it a try next time the signal is lost.
Click to expand...
Click to collapse
Yes you can force the phone to use a certain band, and yes the phone should be doing this automatically but you can use this as a workaround and maybe a future update will solve the problem for you

Question Root related cell reception issues?

I purchased a used US version Rog Phone 5 recently through an online seller. When receiving the phone, I gave it a good once over and powered it on and tested wifi and such and everything seemed to be in good working order. I then rooted the phone and set most of stuff up. After inserting my sim card, I noticed the cell reception was not that great. I suffered through for a couple of days but was missing calls and texts like crazy. I was constantly dropping reception entirely in areas where I have very good signal with other phones. The phone is essentially useless now. I tried several factory resets, flashed back to the non-rooted boot image, and then flashed to an older firmware with no improvements to signal. I can't imagine the reception issue is in any way related to the rooting process, but I'm throwing this out there just in case anyone has seen anything similar in the past.
A few things to note:
I am on AT&T
The APN is definitively configured correctly
I could have returned the phone to the online seller for a refund prior to unlocking the bootloader, but did not insert a sim before rooting, so I have no idea whether the issue was present from purchase or not. Lesson learned, I suppose... do a more thoroughly inspection before doing anything that will void a warranty or refund agreement.
I have tried the same sim in two other phones with no issues.
Everything else about the phone seems to work perfectly, only poor reception.
I had the phone up to approximately 30 miles from my house with no change, so it isn't limited to a specific tower.
Does anyone have any ideas? If I don't come up with anything I will be posting it on ebay as "not working - for parts only" so I will try about anything at this point.

Sim recognition issue
Owned the phone for about a month now. Phone was working perfectly fine for the majority of this time. I use 2 different sims and they were both working smoothly until recently. A few days ago, I woke up and the phone wouldn't recognize the Sim...
forum.xda-developers.com
sim card problem
just all of sudden it became invalid sim try multiple time reset or clear data cache sim toolkit original sim to other phone is working other sim to original phone is working other sim to other phone is working anyone face the same problem...
forum.xda-developers.com
Sounds like they pawned the issue off on you, but it should still be under warranty to have it repaired. When you contact Asus, don't mention unlocking the bootloader. Stick to the hardware concerns.

I have looked over both of those threads, but it seems to be a different issue. My sim is recognized fine, its just the signal strength that appears to be extremely low. Even when the phone has no service at all, it still recognizes the AT&T sim is present.

cpenticuff said:
I have looked over both of those threads, but it seems to be a different issue. My sim is recognized fine, its just the signal strength that appears to be extremely low. Even when the phone has no service at all, it still recognizes the AT&T sim is present.
Click to expand...
Click to collapse
Yes, it is not the same issue, but it appears to be a similar issue. The important detail being that both required a motherboard replacement.