Razr M stuck on 3g!

Had this happen once I tried a bunch of stuff... I can't remember but I think I actually just let it die to 0% and let it charge back to 100% while off... But during that time I also pulled my SD card out put the data on my PC formatted it put data back on... I don't think the new Sim helped at all but it wouldn't hurt to try

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Did you try the battery drain. Also turn the phone off, take the 4g simcard out and ensure no dust is in the slot (maybe blow it with a bit of compressed air).

Sent from my RAZR M xt907 (KitStalk) using Tapatalk

Same issue -- this was how I fixed mine

jrk190 said:

So a few days ago, my Razr M decided to stop using 4g, and is now stuck using 4g. Even after returning to stock 4.4.2, this is still an issue. Any insight as to what's wrong with my phone?

Click to expand...

Click to collapse

I've had this happen after flashing some ROMs (MIUI and older CM versions). It's a ***** to fix, and honestly its mostly trial and error. I did manage to get it to work, but I can't remember the exact series of things I did. You can tell its working correctly when it shows 4G/LTE (not just LTE) and you can still make phone calls, and you can send/receive texts and MMS.

Before trying any of this though, it might just be a KitKat issue -- you will lose a huge amount of reception running the stock 4.4.2 OS. When I tried it I was never able to get 4G due to the poor signals I was getting with KitKat. I would strongly recommend reflashing to the the last Jelly Bean stock firmware (skip gpt.bin and tz.bin) and see if you still have the no 4G issue. I'm running stock JB (with the garbage apps frozen) after trying every ROM out there, because the signals I get are way stronger, and the battery life (might be due to better signals?) is amazing -- I can go 2-3 days without a charge.

In any case, if you still want to try it, I think these settings are the ones you want (what worked for me was actually TOGGLING the settings to something else, then back to the correct ones). Also, this was under JB, but I think its identical with KitKat:

Dial *#*#4636#*#*
Go to Phone Info. Click the menu option and click on the Radio Bands. Change it to US Band. This will break everything.
Go back to the menu and Radio Bands. Change it back to Cellular.

Then scroll down and click on the Preferred Network Type. Change it to GSM/CDMA (Auto). At this point you should see the Location: showing actual info in the BID, SID, NID fields, and GSM will be "In Service", GSRM will be "Connected" and Network Type will probably be eHRPD (which is still 3G).

Click on the preferred network type again and change it to "LTE/CDMA/Evdo". It should change the GSRM to LTE. If not, power off, pull the SIM, power on. Wait for it to say SIM not found. Power back off, put in the SIM and power back on.

Go to your Settings, and under Wireless & networks click on More... and click Mobile Networks. Again, the fix was toggling, so if it says Global, change it to LTE/CDMA or if it says LTE/CDMA, change it to Global. It doesn't matter which one its set to (as long as its one of those 2 and you toggled it).

At this point, I had to let the phone sit for about 10-15 minutes. After I came back, it started switching automatically to 4G/LTE and you should be good to go.

If you can't MMS or text, go back to the Mobile Networks settings, click on Access Point Names, click the menu and reset to default. Power off and power back on.

Hope this helps... GL!

I had the same problem. Lost 4g.
Tried all of the suggestions in this thread and the CM11 and GPE threads in Android Dev section.
Got a new sim card.
All better.

Izaak99 said:

I've had this happen after flashing some ROMs (MIUI and older CM versions). It's a ***** to fix, and honestly its mostly trial and error. I did manage to get it to work, but I can't remember the exact series of things I did. You can tell its working correctly when it shows 4G/LTE (not just LTE) and you can still make phone calls, and you can send/receive texts and MMS.

Before trying any of this though, it might just be a KitKat issue -- you will lose a huge amount of reception running the stock 4.4.2 OS. When I tried it I was never able to get 4G due to the poor signals I was getting with KitKat. I would strongly recommend reflashing to the the last Jelly Bean stock firmware (skip gpt.bin and tz.bin) and see if you still have the no 4G issue. I'm running stock JB (with the garbage apps frozen) after trying every ROM out there, because the signals I get are way stronger, and the battery life (might be due to better signals?) is amazing -- I can go 2-3 days without a charge.

In any case, if you still want to try it, I think these settings are the ones you want (what worked for me was actually TOGGLING the settings to something else, then back to the correct ones). Also, this was under JB, but I think its identical with KitKat:

Dial *#*#4636#*#*
Go to Phone Info. Click the menu option and click on the Radio Bands. Change it to US Band. This will break everything.
Go back to the menu and Radio Bands. Change it back to Cellular.

Then scroll down and click on the Preferred Network Type. Change it to GSM/CDMA (Auto). At this point you should see the Location: showing actual info in the BID, SID, NID fields, and GSM will be "In Service", GSRM will be "Connected" and Network Type will probably be eHRPD (which is still 3G).

Click on the preferred network type again and change it to "LTE/CDMA/Evdo". It should change the GSRM to LTE. If not, power off, pull the SIM, power on. Wait for it to say SIM not found. Power back off, put in the SIM and power back on.

Go to your Settings, and under Wireless & networks click on More... and click Mobile Networks. Again, the fix was toggling, so if it says Global, change it to LTE/CDMA or if it says LTE/CDMA, change it to Global. It doesn't matter which one its set to (as long as its one of those 2 and you toggled it).

At this point, I had to let the phone sit for about 10-15 minutes. After I came back, it started switching automatically to 4G/LTE and you should be good to go.

If you can't MMS or text, go back to the Mobile Networks settings, click on Access Point Names, click the menu and reset to default. Power off and power back on.

Hope this helps... GL!

Click to expand...

Click to collapse

So this worked for me....kinda. It will keep my LTE when I switch back and forth, but only until I call someone. At which point it will stop auto-switching back and forth.

jrk190 said:

So, I got a new SIM, and things worked for a while, but when I tried to make a call, it said "Phone not authenticated". So I go back in, the guy says to dial *228, and 1 to activate. I do it, and the calling works, but I'm back to 3g. So I'm back in this boat again...while I get 4g in my Gnex, with the same Sim...

Click to expand...

Click to collapse

Didn't ATTACK tell you in another thread that *228 fries the 4g sim cards?

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I would factory reset or wait a few days. In a few days a new software update will be rolling out.

jrk190 said:

Probably won't use it. It'll lock my boot loader or unroot me, which I'd hate.

Sent from my DROID RAZR M using XDA Free mobile app

Click to expand...

Click to collapse

It will make you lose root but you can't lock your boot loader after its unlocked... Even taking an OTA. So just flash twrp and flash SuperSU zip and then you're good to go after a OTA

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jrk190 said:

Probably won't use it. It'll lock my boot loader or unroot me, which I'd hate.

Sent from my DROID RAZR M using XDA Free mobile app

Click to expand...

Click to collapse

You're boot loader will not be relocked. . if the ota wasn't relocking the bl and doing just the opposite then you have nothing to worry about regarding that... As for unroot you're unlocked so all you'd have to do is flash SuperSU or use the root method again... If you're stock then rather the FDR just run it in safe mode long press power button till screen pop long press power off till screen pop select OK...if safe mode helps then you'll need to FDR...

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