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Network signal blinking after changing sim card.. help!!

Hi. My brother's note is not rooted and he didn't do anything in it. Today he changed his sim card and when he started up his phone, he cant make any calls or sms. Network signal changes every second from having network to blocked icon. Both sim cards belong to the same network company. He changed back to his old sim card and showed the same. Warranty is out and im ready to fix it if it needs any firmware changes or rooting but he doesnt want to do any of that. I will do it if there is no other solutions.
Thanks
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anyone can help plz?

check if he didnt accidentally bent the connectors
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What connectors?
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Does your carrier have Sim lock. Is it a carrier specific device.

the simcard slot connectors.
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Sim switching

I need help with making my sim from my wife's phone work. We both have HTC one. I keep getting a SIM card error. Any help would be appreciated
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cvv1984 said:
I need help with making my sim from my wife's phone work. We both have HTC one. I keep getting a SIM card error. Any help would be appreciated
Sent from my HTCONE using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Why do you want to switch the UICC?
It will not work in another line's phone for more than 5 minutes. It will give an error when it realizes that the UICC number does not match what is listed on Sprint's end for your account, and disable data until reboot.

Radio completely dead

Yesterday morning when I picked up my moto x I saw that it showed zero signal. Didn't pay attention since I live in a poor signal area anyway. An nor later when I had to make a call I noticed that the signal was still zero. Went to settings and checked status, it says 0 dBm 99 ASU. I went outside where the signal is usually good, and still nothing. After a couple of restarts still 0dbm 99ASU. Then I tried wife's SIM but the same thing. Even two factory resets didn't help. Took it to the service center and they said it was a hardware failure and I'd have to leave my phone for repairs. Estimated time 1 week!
I'm curious to find out if anyone has experienced something similar. What are the chances of a 'hardware failure'. The service tech didn't sound knowledgeable at all, he struggled to even do a factory reset. He kept saying my SIM was faulty and I had to demonstrate to him that my SIM works on a different phone before he came to the hardware failure theory.
I'm worried, should I have left my phone with him?
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tried put another sim card to your moto x ?
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Yes, I tried my wife's SIM and same thing. But I believe that the phone must display signal strength even without a SIM. In this case there is nothing, like as if there was no radio at all.
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Try this download phone testing by diewland go to phone information and toggle turn off radio and press it again to turn it on
Sent from my XT1053 using XDA Free mobile app

My original X lost ability to get a 4g connection. It would drop all cellular connections about every 5 minutes then only connect to 3g. I tried new SIM, but ultimately had to warranty it out for a new X. Just my experience... No problems with new unit.
Sent from my XT1060 using XDA Free mobile app

I hope they fix my phone or give me a new one. Im stuck using the nano SIM in an Atrix 4g now. Wedged it in place with a piece of card. Now and then especially when I walk, the SIM works its way out and I have to keep re seating it.
Sent from my Nexus 7 using XDA Free mobile app

Can someone test something for me? (or maybe already have the answer?)

I'm having issues getting my phone activated with Verizon, even with what I'm told is an already active nano sim. My phone tells me that it has no sim card on the lockscreen, and the sim info app shows nothing for the sim serial. I'm starting to wonder if my sim slot is just bad. I have done a factory reset to no avail
TLR Can someone that has a spare inactive nano sim pop it into their Nexus 6 and tell me it still shows that no sim is installed on the lockscreen?

Have to ask this question......is you sim in right??? Gold side up.
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I bought a tmobile nexus 6 for my GF who is on verizon. She put her sim from her moto X into the nexus and it worked. Do not remember if it said no sim detected but i do remember her using it with the signal bar being greyed out most of the time.

dparrothead1 said:
Have to ask this question......is you sim in right??? Gold side up.
Sent from my SM-T310 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Yep gold side up

Call forwarding enabled by itself

I have the t mobile note 4 that I am using on my ATT account. It is rooted with a custom rom. It has been working great. A little bit ago it made a sound I haven't heard before and on the screen it said call forwarding unconditional now set. So I can't receive any calls on it. I went to the phone settings and when I access the call forwarding screen everything is turned off and it says invalid network or SIM card. I'm pretty sure the SIM card is working because I can send text messages and connect to the LTE network. Any ideas what is going on ore how to fix it?
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https://en.m.wikipedia.org/wiki/Call_forwarding
try some of those codes to deactivate it
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I have tried the #21# which is listed on att help but I get a message that says connection problem our invalid mmI code. I forgot to mention that I have a galaxy gear s that has auto call forwarding enabled on the watch and phone. It has been working great for the 2 months that I have had it.
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call att and ask them to reset your account. Maybe problem is on their side. Did you check if imei on both units are clean?
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Got a replacement SIM card and that fixed the problem. Thanks for the suggestions
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