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I have an Android KitKat based phone. For over a week the phone is getting poor (at times) or no reception but the WiFi and bluetooth is working.

There is a cross near where the range is shown and I get "No Service" in the notification. This screenshot summarizes my situation:

enter image description here

Here is a list of things I tried to do, but did not solve the problem:

  1. Get a new duplicate sim card.
  2. Use a working SIM card from a different service provider.
  3. Switch to 2G mode and back.
  4. Reset my phone.
  5. Completely flash the stock ROM again.
  6. Flash several modems from XDA.

Edit: Even if it is a hardware issue, is it possible to get some debug information? Like for example, somewhere in the kernel logs, it should be possible to know for sure what is happening, right? What and were to look for this information?

Edit2: Device is Lenovo P780, ROW (not chinese) per OP clarification

  • Rooted? Radio logs might help:adb logcat -b radio -v time -d > logcat_radio.log possibly kernel logs would also help. From a root shell: dmesg > dmesg.txt – Bo Lawson Jan 2 '16 at 0:43
  • @beeshyams When I flash, there are many different partitions listed. (Eg: PRELOADER, MBR, EBR,1 RECOVERY etc.) Which one of this would contain the modem? The IMEI is correct. Will IMEI be lost when I flash a new modem? – daltonfury42 Jan 4 '16 at 15:06
  • @beeshyams Sorry I forgot about it. It is a Lenovo P780, ROW (not chinese) with baseband version P780.V24 – daltonfury42 Jan 4 '16 at 15:13
  • Back up your phone and try flashing modems from here forum.xda-developers.com/lenovo-p780/general/…, – beeshyams Jan 4 '16 at 15:18
  • This supports possible modern issue forum.xda-developers.com/lenovo-p780/development/… – beeshyams Jan 4 '16 at 15:26
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Reset Your android just search for recovery mode buttons combination in google for your android

then choose wipe data/cache in that option

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