Database Info

Please Help - Wifi Disabled

I jsut dicovered my new G4's wifi has been disabled by operator. Can anyone help to activate it? There is a red cross over the comm manager on today screen. Please help!!

Do I feel silly or what.
I got rid of the icon (and the whole tray) so I didn't remember, but the cross just means your WiFi is off (not flight mode as I said earlier), which is the default state. Open the comm manager (you can use the button on the left side of the phone) and tap the antenna icon. this will turn WiFi on.
Just in case I am wrong (phone operators don't like devices with WiFi because it reduces data usage by customers) hard reset your phone and quickly soft reset before customization is installed (there should be a 3 second countdown).

What the above poster said.
Or perhaps flash your phone with a new/clean ROM from e.g. qtek. (here)
But flashing the device is not really everyone their thing, so you need to figure out whether you wanna do that at all. Giving it a hardreset without installing the extra apps almost gives the same result.
But don't forget to use the 'ROMUpdateUtility_NoID.exe ' when you try to update, else you get an error. But that's all in the topic there. And don't forget to fully charge battery before update
(hey, this is the upgrading part of website no bad to lead people to the dark side eh? )

wifi
I have tried so many romes and none of them will turn on my wifi is there some trick I need to know about? did you fix your wifi?

Well, when using a different rom I guess the operater doesn't have that much to do with it anymore.
Just when you go into the com-manager you see an icon that looks like an antenna thingy with a little cross next to it. Just press it and there you have wifi (should become yellow without the cross).
That should be working standard with a 'normal' rom like the new qtek one. Connecting is another story though once the wifi is enabled (connecting with wifi is a bit tricky at times).

I flashed the qtek rom on my Dopod 830 (bought in China) successfully. However, the wifi on the comm manager still failed to activate. So the assumption (conclusion) is China Telecom simply removed the the wifi chip.

I think you may just have a faulty device.
To my knowledge, no phone company actually has the facility, or would bother with the enormous cost of modifying devices in such a way.
Could you be more specific as to what happens? I have a feeling there is a big misunderstanding here somewhere.
You press the button on the side, the comm manager comes up, you click the icon with an antenna and...
a) noting happens.
b) error message pops up.
c) wait cursor (circle with 4 colors) appears, but the button remains with the x.
d) non of the above.
I think you may have rushed a bit with flashing different ROMs. Try putting the original ROM back, without the extended ROM and see what happens.

Thanks levenum! My problem is (c), there is a waiting sign and the icon remained x. The original rom is in simplified chinese CHS and now I am having the 2.20.7.34 wwe with everything running fine except wifi. Will try to flash back to a CHS rom and see what is happening.

Well that does sound like a hardware / driver problem, but it is more likely a fault than intentional deactivation.
Is the phone under warranty by chance?
If so, once you have the original ROM you might try getting it repaired in the lab.
Also check the phone details on the site of your phone company. Do they state this model has WiFi or do they 'conveniently' omit it.

I checked with China Telecom and Dopod, they said the wifi chip has been removed. I am not sure how they can remove the chip but many phones selling in China have got wifi removed. How can I know the wifi is physically removed or is jsut deactivated?

iyfchan said:
I checked with China Telecom and Dopod, they said the wifi chip has been removed. I am not sure how they can remove the chip but many phones selling in China have got wifi removed. How can I know the wifi is physically removed or is jsut deactivated?
Click to expand...
Click to collapse
I have exactly the same problem with you, as I searched the forum, some poster tell that Dopod from China mobile, the wifi chip is factory removed.
Does anyone have the schematic of the full-function prophet, so i could locate the wifi chip position, so i can upgrade my Dopod 830 by hardware way
thanks

VZW GS3 i535 - Error with CM10 Update, have 4G data but NO MOBILE NETWORK

So long story short...
- Updated to CM10 official "stable" build last night (from November 1st Nightly, which I never had issues with)
- Started it up, phone wouldn't activate.
- Read about a hotfix. Wiped, flashed, applied hotfix, etc.
- Still could not activate/receive phone calls.
- Tried to flash back to stock with root and it didn't work.
- Realized my IMEI was missing.
- Followed a guide to get my IMEI back.
- Still not much progress. I can get 4G data, but when I try to make a phone call it says "Mobile network not available".
- Decided to ODIN + flash 100% stock
- Still no phone calls sending/receiving.
Now I can access 4G data, but I cannot make or receive phone calls. I have tried various wipes, resets, battery removals, SIM removals, etc. etc.
Anyone have any advice for me? It has been about 12 hours now that I've been without service.
It does show that I have 3-4 bars on the status bar, but I still cannot make calls.
Much appreciated.

aereolaite said:
So long story short...
- Updated to CM10 official "stable" build last night (from November 1st Nightly, which I never had issues with)
- Started it up, phone wouldn't activate.
- Read about a hotfix. Wiped, flashed, applied hotfix, etc.
- Still could not activate/receive phone calls.
- Tried to flash back to stock with root and it didn't work.
- Realized my IMEI was missing.
- Followed a guide to get my IMEI back.
- Still not much progress. I can get 4G data, but when I try to make a phone call it says "Mobile network not available".
- Decided to ODIN + flash 100% stock
- Still no phone calls sending/receiving.
Now I can access 4G data, but I cannot make or receive phone calls. I have tried various wipes, resets, battery removals, SIM removals, etc. etc.
Anyone have any advice for me? It has been about 12 hours now that I've been without service.
It does show that I have 3-4 bars on the status bar, but I still cannot make calls.
Much appreciated.
Click to expand...
Click to collapse
i don't know the number off the top of my head, but someone said to call the # that gets your number reprovisioned, that could possibly fix the issue thats plaguing you
edit: just did a quick search and someone said just call verizon from another phone and say "hey, i need ya to reprovision my phone, its number is blahblahblah" and just go thru it that way

digitalsynner85 said:
i don't know the number off the top of my head, but someone said to call the # that gets your number reprovisioned, that could possibly fix the issue thats plaguing you
Click to expand...
Click to collapse
Try to reprovision your sim card using this code:
*2767*3855#
It will format your internal storage so back it up. You must be on TouchWiz as well.
Sent from my SCH-I535 using xda app-developers app

Same Issue!
Still not much progress. I can get 4G data, but when I try to make a phone call it says "Mobile network not available".
- Decided to ODIN + flash 100% stock
- Still no phone calls sending/receiving.
Now I can access 4G data, but I cannot make or receive phone calls. I have tried various wipes, resets, battery removals, SIM removals, etc. etc.
Anyone have any advice for me? It has been about 12 hours now that I've been without service.
It does show that I have 3-4 bars on the status bar, but I still cannot make calls.
Much appreciated.[/QUOTE]
Same nearly EXACT problem for me. Back on stock now still no phone but I do have data. Did the provisioning code but still get mobile network not available message. Did calling Verizon work? Any help greatly appreciated!

jamestheartist said:
Still not much progress. I can get 4G data, but when I try to make a phone call it says "Mobile network not available".
- Decided to ODIN + flash 100% stock
- Still no phone calls sending/receiving.
Now I can access 4G data, but I cannot make or receive phone calls. I have tried various wipes, resets, battery removals, SIM removals, etc. etc.
Anyone have any advice for me? It has been about 12 hours now that I've been without service.
It does show that I have 3-4 bars on the status bar, but I still cannot make calls.
Much appreciated.
Click to expand...
Click to collapse
Same nearly EXACT problem for me. Back on stock now still no phone but I do have data. Did the provisioning code but still get mobile network not available message. Did calling Verizon work? Any help greatly appreciated![/QUOTE]
Try a new sim card?

bageloid said:
Same nearly EXACT problem for me. Back on stock now still no phone but I do have data. Did the provisioning code but still get mobile network not available message. Did calling Verizon work? Any help greatly appreciated!
Click to expand...
Click to collapse
Try a new sim card?[/QUOTE]
Yep. Put my girlfriend's in and same thing. Going to try re-rooting, installing stock TW again, and see what happens.

jamestheartist said:
bageloid said:
Try a new sim card?
Click to expand...
Click to collapse
Yep. Put my girlfriend's in and same thing. Going to try re-rooting, installing stock TW again, and see what happens.
Click to expand...
Click to collapse
Your eri might be borked... The only way I was able to fix that on my phone was using the now deleted IMEI and ERI tool thread.
edit:http://webcache.googleusercontent.c....6.0...0.2...1c.1.15.psy-ab.DIaMHJmSIlU&pbx=1
Unfortunately the attachment links are dead

Damn, that's what I figured too. I have seen some issues semi-related to this subject with others who were running CM 10.1 roms, not just S3 owners, so I guess that no matter how many times you do something right, sometimes things still go wrong, It just is what it is, or that damn program HiApn was a little beyond me, and I borked it up that way. Got the new TouchWiz multi-window OTA update update fine though, re-rooted it and was going to explore it further, but I think I'm just going to replace it under warranty since the one year will be up in a couple weeks. Sorry to do that, since it keeps the price of phones high, but crap. It looks like it's toast for telephony, although 911 DOES work, just nothing else phone related. It sees my phone number, and can read that much of the sim, and my IMEI appears to be true. Strangest damn thing! Oh well, looks like a re-locked bootloader and Triangle Away for me.Thanks for your responses, best of luck to the OP....
(Oh, and btw, I actually like that multi-window feature, so when I get my new one, I'm just going to leave it factory!)
Wait a minute...borked ERI? That's fixable? If it's not too radical, I have a few days to try that before I have to send my original phone back, so if I can fix it I'd rather do that.
After reading that post you put up a link to, my ERI is already at 5...?

[Q] Nexus 5 radio refuses to turn on

Hi all,
My Nexus 5 was working perfectly fine on Purity ROM for months. A week ago, the battery ran down and the phone turned off. I charged it overnight, and when I powered it on next day, It had no mobile service. Trying to search for networks, I get "Error while searching for networks".
I toggled airplane mode... no change.
I rebooted the phone... no change.
I checked the phone status, signal strength was zero, and the radio showed as off.
SIM was replaced to no avail, and the original SIM works fine in another phone.
To troubleshoot, I reflashed to current stock images (KTU84P) and wiped cache; no luck.
I have now tried every stock ROM back to KOT49H, and even tried the dev preview of L.
I also tried flashing Carbon, SlimKAT, and MIUI, nothing changes.
Dialling *#*#4636#*#* brings up the testing menu, but I can't turn on the radio. No error, it just won't toggle the button.
I tried to flap the radio via adb shell using
radiooptions 0<reset radio>
radiooptions 5 <turns radio on>
radiooptions 6 sp.telus.com <sets APN>
At one point it came alive enough to tell me I had voicemail, showed my phone number, and showed me a list of available APNs, but that's it. It still wouldn't find any networks.
I checked the radio log:
logcat -b radio
This pops up when I try to search for networks
D/RILJ ( 1413): [0735]> QUERY_AVAILABLE_NETWORKS
D/RilRequest( 1413): [0735]< QUERY_AVAILABLE_NETWORKS error: com.android.internal.telephony.CommandException: GENERIC_FAILURE ret=
and this when I try to manually turn on radio in testing menu:
D/RILJ ( 1413): [0738]> RADIO_POWER on
D/RilRequest( 1413): [0738]< RADIO_POWER error: com.android.internal.telephony.CommandException: GENERIC_FAILURE ret=
I rooted and installed GetRIL; it reports "Unknown RIL found", and the only RIL it has available for install is M8974A-1.0.25.0.23 (from build KOT49H). I suspect the database is out of date.
Any suggestions? I can't believe this is a hardware failure out of the blue.
Thanks in advance for any help.

Same problem here
upright_animal said:
Hi all,
My Nexus 5 was working perfectly fine on Purity ROM for months. A week ago, the battery ran down and the phone turned off. I charged it overnight, and when I powered it on next day, It had no mobile service. Trying to search for networks, I get "Error while searching for networks".
I toggled airplane mode... no change.
I rebooted the phone... no change.
I checked the phone status, signal strength was zero, and the radio showed as off.
SIM was replaced to no avail, and the original SIM works fine in another phone.
To troubleshoot, I reflashed to current stock images (KTU84P) and wiped cache; no luck.
I have now tried every stock ROM back to KOT49H, and even tried the dev preview of L.
I also tried flashing Carbon, SlimKAT, and MIUI, nothing changes.
Dialling *#*#4636#*#* brings up the testing menu, but I can't turn on the radio. No error, it just won't toggle the button.
I tried to flap the radio via adb shell using
radiooptions 0<reset radio>
radiooptions 5 <turns radio on>
radiooptions 6 sp.telus.com <sets APN>
At one point it came alive enough to tell me I had voicemail, showed my phone number, and showed me a list of available APNs, but that's it. It still wouldn't find any networks.
I checked the radio log:
logcat -b radio
This pops up when I try to search for networks
D/RILJ ( 1413): [0735]> QUERY_AVAILABLE_NETWORKS
D/RilRequest( 1413): [0735]< QUERY_AVAILABLE_NETWORKS error: com.android.internal.telephony.CommandException: GENERIC_FAILURE ret=
and this when I try to manually turn on radio in testing menu:
D/RILJ ( 1413): [0738]> RADIO_POWER on
D/RilRequest( 1413): [0738]< RADIO_POWER error: com.android.internal.telephony.CommandException: GENERIC_FAILURE ret=
I rooted and installed GetRIL; it reports "Unknown RIL found", and the only RIL it has available for install is M8974A-1.0.25.0.23 (from build KOT49H). I suspect the database is out of date.
Any suggestions? I can't believe this is a hardware failure out of the blue.
Thanks in advance for any help.
Click to expand...
Click to collapse
Hey man, I'm having the exact same problem. Have you been able to fix it?

Please, don't let the thread die!
I'm also facing the same problem here. I flashed stockversion multiple times to fix, but no success.
I'm getting the same errormessages at logcat, mostly:
isDataAllowed: not allowed due to - Attached= false - SIM not loaded
after 20 hours of investigation still no result.
I'll get in contact with the Google Support tomorrow and I still won't believe this is a hardware problem, especially because my warranty exceeded at f**king Wednesday 27th of January 2015 (one day before the problem occurred).
Please help!

I'm having the exact same issue - phone was working fine until the battery went completely dead during the night. It took me a while to even get it to boot up again and when I did there was no network connection (also says 'no sim card' on lock screen) but everything else is working fine. I flashed stock 5.0.1 onto it and did a factory reset but nothing worked (SIM card also works fine in another phone so its not a network issue). I found this post after finding out about the testing menu and the turn radio on button not responding. I had a look at logcat and it prints out those same messages for me. I think this is probably the first time i've rebooted or let the power get that low in a long time so I'm wondering if cutting the power to the radio triggered something or some sort of internal battery died. Anyone any ideas?

I checked the RIL sequence in a working phone when it has no sim card inserted and it's different to the POWER error shown in the OP's post:
D/RILJ ( 2002): [0049]> RADIO_POWER
D/GSM ( 2002): Radio State: SIM_LOCKED_OR_ABSENT
D/RILB ( 2002): Notifying: SIM locked or absent
so it seems it's unrelated to a missing/broken sim card. I guess it must be down to a hardware fault in the qualcomm chip or connections to it, e.g. damaged pins, modem firmware corrupted, something shorted or dirty etc.
Is there anything I can do to verify this is the case? Like maybe try to send some AT commands directly to the modem, or inspect the phone for damage/dirt (I'm unsure as to where the modem chip/antennas/contacts are on the phone)? It seems to be not an uncommon problem after a year or so of use. I tried to examine the kernel logs e.g. dmesg but didn't notice anything obvious and not really sure what to look for.
Any help much appreciated as the phone is out of warranty (albeit only slightly) and probably not worth the repair cost (if it's even possible to fix).

Did any of you ever find a fix for this issue? I seem to be having the same problem.

lazytt said:
Did any of you ever find a fix for this issue? I seem to be having the same problem.
Click to expand...
Click to collapse
This issue is called "side effects of custom roms".

Is it contagious? Because I dont run custom roms

lazytt said:
Is it contagious? Because I dont run custom roms
Click to expand...
Click to collapse
No. Then you don't need a doctor. You can get a new SIM card or switch to other network provider.

zagorteney said:
No. Then you don't need a doctor. You can get a new SIM card or switch to other network provider.
Click to expand...
Click to collapse
I tried a different network/sim card with the same results. This phone was working fine just a few days ago. It suddenly stopped connecting.

Are they any noticeable bulges to the battery on the rear of the unit? Any battery problems during normal use?

Hello guys. Same problem.. I bought a nexus 5 from someone on ebay and I was ripped off... At first I had the "red light of death" when plugged in.. Then after a few minutes it turned on but was stuck on infinite boot loop and couldn't get past the welcome screen. So I left it for an hour and came back and it managed to stay on for 5-10 minutes at a time. Then I tried my sim card to see if it would connect.. And it didn't it just keeps saying searching.. then it said "error while searching for networks" choose automatically says "cannot connect to this network at this time. try again later" I tried a few self troubleshooting tips but nothing worked...
I went into phone info and it says radio is off and like others, radio cannot be toggled on.. The sim card works in my other phone but not this one. And the APN settings show up..... so im guessing from what people are saying about this problem is that perhaps someone tried to flash a rom that wasn't compatible? And can anyone verify if someone can reflash the stock image or firmware or w/e is that'll do it? Can anyone help me please

povertyd said:
Hello guys. Same problem.. I bought a nexus 5 from someone on ebay and I was ripped off... At first I had the "red light of death" when plugged in.. Then after a few minutes it turned on but was stuck on infinite boot loop and couldn't get past the welcome screen. So I left it for an hour and came back and it managed to stay on for 5-10 minutes at a time. Then I tried my sim card to see if it would connect.. And it didn't it just keeps saying searching.. then it said "error while searching for networks" choose automatically says "cannot connect to this network at this time. try again later" I tried a few self troubleshooting tips but nothing worked...
I went into phone info and it says radio is off and like others, radio cannot be toggled on.. The sim card works in my other phone but not this one. And the APN settings show up..... so im guessing from what people are saying about this problem is that perhaps someone tried to flash a rom that wasn't compatible? And can anyone verify if someone can reflash the stock image or firmware or w/e is that'll do it? Can anyone help me please
Click to expand...
Click to collapse
Open up a eBay dispute and they'll refund you

dicecuber said:
Open up a eBay dispute and they'll refund you
Click to expand...
Click to collapse
Heh... Problem is guy listed it for "parts only" (plz dont burn me just read my reason why..)but the description only said phone gets warm when charging and battery doesn't last all day.. I could have lived with that except the phone was a steaming pile and there were several issues.. After speaking with him yesterday and today, he only offered a 50 usd partial refund or to send it back and get 120 USD back. I talked him into a 60usd refund... I wasnt sure if I could get any money back at all if I went through ebay or paypal. I'll either keep it as an iPod now or sell it as is. And lose only 50 bucks or something.
So tonight I found a guy locally who knows how to root androids and fix issues like this stuff... He spent an hour and a half on my phone... Tried everything... And NOTHING worked. So.. Whatever... Lesson learned...

lolcakes203 said:
Are they any noticeable bulges to the battery on the rear of the unit? Any battery problems during normal use?
Click to expand...
Click to collapse
no and no

I've been busy so wasn't able to look into this any further since. I think it might be related to the battery somehow, as I've read several reports of how it started when the phone ran out of juice completely. My next step was to try to send AT commands directly to the modem to see if it responds at all but I reckon something got fried or a particular power circuit cut out.

Same problem
I wish someone would post a fix for this. I'm having the same problem

I have this problem too. Starts on saturday after run out of battery. Someone found a solution?! please!!!

same error messages but not the same phone
http://forum.xda-developers.com/gen...rk-caterpillar-s50-help-t3142484#post61543201

upright_animal, did you solve the problem?

[Q] OnePlusOne - Numerous Issues?!

Hi everyone,
I recently bought the phone from T-Dimension and it's having some issues and I was wondering if anyone could help me out or if they've run into something similar. The issue is I can't seem to send/receive any calls and I can't send/receive any texts. The bizarre thing is it works for the first 45 seconds when I reboot but then locks me out straight after that. The phone is issued from Hong Kong and had Color OS on it but I flashed CyanogenMod onto it, here's some more information.
- The phone is connected to Amaysim, which runs of the Optus network I believe, so it's connected onto the mobile network just fine.
- The Micro-SIM card I'm using is brand new, it's put in correctly into the slot, meaning upside down facing towards the bottom of the phone, so that's fine.
- I've tested the SIM with other phones and it works perfectly fine.
- When it locks me after 45 seconds, it fluctuates from saying, "Call Not Sent" to just it being stuck on the dialling screen.
- After being locked out, I can't receive any calls either, I've tried calling the phone but nothing shows up.
- After being locked out, I can't receive any messages either, when I try to send a message it just stays stuck in sending, and if I restart the phone, it just says the text failed.
- I've contacted Amaysim Help Desk, and they say my problems lie with the phone being locked, and I'll have to contact the manufacturer to sort it out.
- I've also contacted my supplier, who seems to have trouble finding out the issue.
- APN settings are set correctly with my mobile carrier.
- Already done a factory reset, didn't fix the issue.
- Put the preferred network type to 3G under Mobile Network settings.
- I flashed CyanogenMod 11S using this tutorial from youtube, /watch?v=QDKOEtN9pbo and downloaded the cm-11.0-XNPH22R-bacon-signed.zip file.
Please can anyone help me with issue, sorry for long wall of text, I really want this phone to work!
Cheers,

You probably should flash another modem & then try.Here
http://forum.xda-developers.com/showthread.php?t=2824139
Sent from my One using XDA Premium 4 mobile app

LukaZilla said:
Hi everyone,
I recently bought the phone from T-Dimension and it's having some issues and I was wondering if anyone could help me out or if they've run into something similar. The issue is I can't seem to send/receive any calls and I can't send/receive any texts. The bizarre thing is it works for the first 45 seconds when I reboot but then locks me out straight after that. The phone is issued from Hong Kong and had Color OS on it but I flashed CyanogenMod onto it, here's some more information.
- The phone is connected to Amaysim, which runs of the Optus network I believe, so it's connected onto the mobile network just fine.
- The Micro-SIM card I'm using is brand new, it's put in correctly into the slot, meaning upside down facing towards the bottom of the phone, so that's fine.
- I've tested the SIM with other phones and it works perfectly fine.
- When it locks me after 45 seconds, it fluctuates from saying, "Call Not Sent" to just it being stuck on the dialling screen.
- After being locked out, I can't receive any calls either, I've tried calling the phone but nothing shows up.
- After being locked out, I can't receive any messages either, when I try to send a message it just stays stuck in sending, and if I restart the phone, it just says the text failed.
- I've contacted Amaysim Help Desk, and they say my problems lie with the phone being locked, and I'll have to contact the manufacturer to sort it out.
- I've also contacted my supplier, who seems to have trouble finding out the issue.
- APN settings are set correctly with my mobile carrier.
- Already done a factory reset, didn't fix the issue.
- Put the preferred network type to 3G under Mobile Network settings.
- I flashed CyanogenMod 11S using this tutorial from youtube, /watch?v=QDKOEtN9pbo and downloaded the cm-11.0-XNPH22R-bacon-signed.zip file.
Please can anyone help me with issue, sorry for long wall of text, I really want this phone to work!
Cheers,
Click to expand...
Click to collapse
Hey there fellow Aussie. See link provided by other member, it should fix you up.
Transmitted via Bacon

That modem actually proved to be worse for me.. Before I didnt have stable 3G connection.. that modem made my 4G connection worse too. The best, and most stable modem I have found thus far is in the latest nightlies. It is still very very very weak when it comes to 3G connectivity but its better than everything else I have tried. And believe me, I have tried pretty much every rom there is on this forum including XNPH22R, XNPH25R, MahdiRom, CyanHacker, and All the nightlys.
The only one I havent tried is Color OS because I am afraid it will lock my bootloader again.

No SIM (possible radio malfunction?)

This issue is driving me crazy.
For the past few months, every so often (semi-rarely), I would lose cell service and then the phone would say "No SIM" -- can't make calls, send SMS, etc. Then the problem would resolve itself on a reboot.
Last night, however, the "No SIM" issue happened and I couldn't resolve it on a reboot.
I've tried everything I can think of:
- Toggled airplane mode and every other easy OS setting I can think of
- Ejected and inserted the SIM card and cartridge multiple times
- Flashed a few different ROMs
- Flashed different modems/firmware multiple times
- Confirmed the IMEI is still intact
- Mucked around in the *#*#4636#*#* menu to no avail (after everything else failed)
I don't think it's a issue with the SIM card itself, as I already tried an older card I had; the problem persists. So I was wondering... is it possible the cellular radio has malfunctioned hardware-wise? Is this something that has happened to other users?
P. S. The Wi-Fi radio works fine, and I imagine Bluetooth does as well. It's just the cell radio that's problematic.
If there's a specific detail I forgot to mention, let me know and I will clarify. Thanks for reading.

FYI, I believe I fixed the problem. The solution was just maintenance/cleaning.
Pried off the back of the phone where the battery is for the first time; cleaned all the copper endpoints sticking out, as well as the antennae traces on the rear panel with alcohol. Stuck a piece of sticky paper on the back of the SIM caddie so it wouldn't move around in the slot so much.
That seems to have done it. Haven't experienced a "no SIM" message yet, but I'll post back here if it returns.