[Q] Extremely weak wifi - AT&T, Rogers, Bell, Telus Samsung Galaxy S III

Hi guys.
I don't know if its my phone or if this is the way the phone is meant to be, I have an extremely weak wifi signal. I am literally right next door to my router and I only get 3/4 bars for signal strength. As soon as I go up to the second floor, I get nothing at all unless I'm directly above my router. This is extremely frustrating at the moment. I decided to lurk around the forum to see if installing a custom rom would help and I ended up installing Jedi Invasion 2; it did not help at all.
It's just so frustrating that I have to use my mobile internet when I'm in bed instead of using my home internet. I don't understand this at all. Why is it so weak? Does anyone else have this problem?
Thank you.

Im with you on this......im staying tuned..
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Have you tried updating your modem to the latest version that was just released?

My modem is perfectly fine. I just dont understand how my old crappy blackberry had a better and stronger connection than my s3.
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I found the Wi-Fi performance increased a fair bit when I upgraded to 4.1.1. I can go a fair ways in my house before dropping bars. Wish I had run WiFi Analyzer before the upgrade so that I could actually compare RSSI.

Depends on the router freq. 2.4ghz and 5ghz. 5ghz can cause crappy WiFi strength issues. Change the settings around to 2.4 only and see what happens.
i727-ucle2-SkY IcS

My router does not support dual band. Like I said earlier, my blackberry has a stable connection while my s3 struggles.
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I had the same problem in 4.0.4 ICS but now on 4.1 JB it is working perfect. Before on ICS I had like 3-4 bars when I was 2ft away from the router. Now on JB I have full 5 stable bars no less with higher distance.

ShaolinMilk said:
My modem is perfectly fine. I just dont understand how my old crappy blackberry had a better and stronger connection than my s3.
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The modem he is talking about is a radio for the phone. Not the modem that connects you to the internet through your ISP.

Oh. Im still relatively new to this device so I never knew. How do I update the modem?
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ShaolinMilk said:
Oh. Im still relatively new to this device so I never knew. How do I update the modem?
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Well first thing your going to have to do is root the phone before you can update your modem.
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Att is rolling out jelly bean now through kies. Id just do that before you hit the modding route. Jelly Bean will update you too there latest and greatest modem and boot loader updates. Then root it and never look back
i727-ucle2-SkY IcS

So I went ahead and installed the latest modem. It made my signal even worst somehow. How do I restore back to the one I had?
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ShaolinMilk said:
So I went ahead and installed the latest modem. It made my signal even worst somehow. How do I restore back to the one I had?
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Download it and flash it.

Im not exactly sure which modem it was.
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There's only three modems for each carrier. Try them all.
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Related

Terrible WiFi speeds on CM9?

Am I the only one this is happening to?? Haven't seen anything about it on here but my speeds on GB before CM9 were about 30 MB down and 2 up and after flashing CM9 they average 8-10 down and 1 up. Any ideas on why that could be?
Edit: Using the same modem, FC24
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Maybe try to go to advanced wifi settings and change the frequency to only 2.4ghz. Seemed to help me.
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sure its not just network congestion? are you able to pull 30/2 on your computer right before running speedtest on your phone?
over both 2.4ghz and 5ghz i am able to pull 40/12 using the latest CM9 alpha 2 build. I'm on modem EL29.. who knows if thats a factor tho.
brooksyx said:
Maybe try to go to advanced wifi settings and change the frequency to only 2.4ghz. Seemed to help me.
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Click to collapse
Tried that. No luck..
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autoprime said:
sure its not just network congestion? are you able to pull 30/2 on your computer right before running speedtest on your phone?
over both 2.4ghz and 5ghz i am able to pull 40/12 using the latest CM9 alpha 2 build. I'm on modem EL29.. who knows if thats a factor tho.
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Still getting good speeds on the computer on 2.4 and 5 ghz but only about a third of that on my phone. I even tried six different modems. I don't understand what's going on..
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What kind of reception are y'all getting

On jb ROMs vs. Stock ROM? My reception indoors is horrible. And outside it drops sometimes to nothing then comes up back down. You just never know
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Ummmm it should be the same
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Gotta disagree here. No problems for me.
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I know its like cursing someone's mom but I'm seriously thinking about a iPhone 4s I'm tired of this ****
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I'm not sure if that's the phone's fault. Because I always get full bars unless im in a rural area with not much around. Even in basements I get 2-3 bars when my friend's have zero signal
PhoenixBlitz said:
I'm not sure if that's the phone's fault. Because I always get full bars unless im in a rural area with not much around. Even in basements I get 2-3 bars when my friend's have zero signal
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What modem you running
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I just flashed to cm10,but I was using stock firmware all last week and I think reception is great both indoors and outdoors. I use to get no reception in certain elevators with my nokia and xperia play. With the Samsung, in those areas I get 3to4 bars.
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paniro187 said:
What modem you running
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I'm on stock, so whatever that is, I'm using it. Although I can confirm that using JB roms (such as CM10) on and s3 has no effect because my friend has the identical model I do (Both of ours were locked to Rogers before we both unlocked them to use on Telus) and the signal is always the same
Sometumes my bars drop to nothing and there is a black signal bars with grey out line and it will do that for a couple minutes then jump up to 4g or what ever reception I get at the time. Then out hers I'll get full bars. Sometimes I get no data at all just call with no internet. Maybe I got a NAD phone or something
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Help, no 4g, horrible 3g

For the love of god, someone please help after I explain wth is going on.
Ive been running Infamous Rom for a while & a few days ago, my 4g startef acting up. I tried a different rom but no real change. I went back to Sonic FreeGS3 which had previou as ly ran fine but my 4g still sucks. Most apps are ok but Play Store & my web browsers refuse to load 9/10 times. I tried flashing UVLI6 & 5 modems but nothing. Do you guys think my 4g antenna went out? My wifi works flawlessly.
I live in NYC & most people had said UVLI6 was great here but not for me. Please help
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Did you check your imei?
Settings, about device, status.
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Still got my imei, flashed a different modem late last night & so far so good. I had the same problem with my wifes phone after I rom'ed hers but I restored it & it was fine after. I guess T Mobile changed something and I was on the wrong frequency to get a signal.
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Maybe you're in an area that was recently refarmed/upgraded.
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Im in brooklyn ny so its possible. I used a trick I saw online about keeping the ohone in wcdma only & that had worked from the day after I made this post til now. Is there an updated radio available or would I have to flash back to the latest stock rom? This is really starting to annoy the hell out of me
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All modems are avail thru link in my sig.
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Same thing has been happening to me. I'm in the upper Manhattan area and getting really poor 4g in my apt, like 1 or 2 bars, and dropping to 2g. I started noticing it yesterday. I'm calling T-Mobile tomorrow to see what's up.
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Sounds to me like they may be doing maintenance or upgrades.
Call T-Mobile though and they should be able to tell you for sure.
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[Q] No service at work. Any help?

Ive noticed since I moved offices, that in my office building I get absolutely no service whatsoever. And there is no wifi password available to use wifi via my phone. So today as I was leaving work and finally got service again, I had 12 missed calls, 5 texts, and 3 voicemails. Is there a better modem to flash that can help? Thanks!
Not exactly. Different locations have different best modems. You just have to try them and see.
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Could anyone suggest an updated modem, or one they have had luck with if they are from the Chicago-land area?
You could check the map in the modem thread too. I know its a jumbled mess now, but the info can still be useful.
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yeah, i was trying to find my way through it but it is difficult so it hasnt really helped
K. Sorry bout that. Ill be redoing everything in it soon though.
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Do you think you could message me about what modem/radio might work better once that forum is sorted out? It really sucks not being able to use my phone at work for 8 hours. Thanks
I may not be able to unfortunately. I messed around a little before and got nowhere. May have to start a new map.
Have you checked T-Mobiles coverage map yet? There just may not be a signal there in the first place.
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DocHoliday77 said:
I may not be able to unfortunately. I messed around a little before and got nowhere. May have to start a new map.
Have you checked T-Mobiles coverage map yet? There just may not be a signal there in the first place.
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I never had a problem with my Blaze there. Even at home with the S3 I get maybe 2 bars. Which leads me to believe its the modem. On my Blaze I had an updated modem that made data very fast.
Can I use UVLI6 which is a 4.1.1 modem on a 4.1.2 rom I am currently using? Would that be compatible? i cant remember which way compatibility goes :/
Any modem, any rom, any build. Only make sure you use the right models modems, which it sounds like you are
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itsLYNDZ said:
Can I use UVLI6 which is a 4.1.1 modem on a 4.1.2 rom I am currently using? Would that be compatible? i cant remember which way compatibility goes :/
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It will work, but last time I did that I wasn't able to connect to hspa or hspa+ only umts.. If it gives you signal though I guess its better than nothing
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itsLYNDZ said:
Can I use UVLI6 which is a 4.1.1 modem on a 4.1.2 rom I am currently using? Would that be compatible? i cant remember which way compatibility goes :/
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Click to collapse
You can use any modem version as long as it's specifically for your phone.
itsLYNDZ said:
Can I use UVLI6 which is a 4.1.1 modem on a 4.1.2 rom I am currently using? Would that be compatible? i cant remember which way compatibility goes :/
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And just in case for some reason you need to hear the same answer a 4th time, yes you can do that! LOL!
serio22 said:
It will work, but last time I did that I wasn't able to connect to hspa or hspa+ only umts.. If it gives you signal though I guess its better than nothing
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This is just strange... in roughly a year of doing this I think you're the first to report that happening. 4.0.4 and 4.1.1 modems have always worked on 4.1.2, and any other combo has worked as well. There are people who still use the LH2 (ics) modem because it still performs better than any other for them.
I think you may have been seeing it function normally though. When idle, its supposed to drop to UMTS to save power and bandwidth. If you check while a transfer is occurring you will see it change to HSPAP.
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Has anyone else found another modem that they now use that gives them better signal/data speeds for their Tmobile T999? My work building is a complete dead zone for Tmobile, so I am hoping flashing another modem works. Otherwise, im not sure what else I can do.
I have to refer you to my initial response here. A modem that gives better speed and signal for me, might be one of the worst for you.
Just something to consider, you probably could test 2-3 different ones each day at work. Maybe more. If your main issue is signal, then flash, check service, if none then flash another right away. I could probably flash 5 different ones on a 15 min break if I was only looking for improved signal. Might be a better way than waiting for someone to tell you what worked for them, then testing only that the next day. Its your phone and your time though, so its your call. Just tryin to help
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DocHoliday77 said:
I think you may have been seeing it function normally though. When idle, its supposed to drop to UMTS to save power and bandwidth. If you check while a transfer is occurring you will see it change to HSPAP.
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Nope I know all about that.. it would never get to hspa, always umts, ran it for days and as soon as I switched to a jb modem I got hspa back
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serio22 said:
Nope I know all about that.. it would never get to hspa, always umts, ran it for days and as soon as I switched to a jb modem I got hspa back
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So weird....figured you would know, but wasnt certain. Still, never heard of one doing that. Finicky huh?
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I use the UVMD5 modem and my signal is strong but my battery dies faster...
DocHoliday77 said:
So weird....figured you would know, but wasnt certain. Still, never heard of one doing that. Finicky huh?
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Yeah it is weird.. I tried with both touchwiz and aosp with the same result
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Who noticed a Great gain when flashing the fnb4 modemn such as better signal, faster

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Im on the mk2 modemn and Im lucky to get 1 or 2 signal bars.
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Me definitely. Before I used to get like 1 to no bars or service in my room but now I get 3 at the least. Call quality is so much better as well
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I noticed my LTE speeds jumped up about 5mbs but my battery life was reduced to about 4 hours using Hyperdrive.
It's definitely been an improvement for me. Less call drops with the people I call most.
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The first time I tried it, I only got Edge, and had many problems.
reverted to stock and rooted and reloaded my nandroid backup and tried again....
Wow! there is a DEFINITE DIFFERENCE !!! I am now getting LTE with more bars, and also I see 4G where I hardly ever saw it in my house! Now, after the flash, I almost NEVER see EDGE anymore. I think this is a superb improvement to the GS4...
just for anyone's knowing...
I am on 4.2.2 and had upgraded the baseband to UVAMDL and it still shows that in "About phone" but the results are better than anything I have attempted before... I even got a Signal Booster from TMO lol... Now I don't need it!
Great find and fix guys!
Aloha !
O.k. I finally got my baseband updated to fnb4 and my signal Is awesome and I'm getting 4G Lte in alot more places now. Thanks
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Does this apply only to phone calls or is data faster, too?
Does this apply only to phone calls or is data faster, too?
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Yes my data is alot faster.
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Signal for me is stronger and for whatever reason LTE is faster too. I didn't update the LTE radio so I can't explain that but I'll take it.
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