No more network coverage on my sim cards.

[Horia1]

After updating Lolipop 5.1.1 my Xperia Dual (D6633) doesn't recognize anymore my sim cards. Like there is no network coverage. Please advice. THANK YOU!

[Phy]

repair the phone with Sony PC Companion and see if that helps.

http://support.sonymobile.com/gb/tools/pc-companion/

[Jake-SonyXperia]

Hi Horia1,

Welcome to the community,

Here are the instructions on how a software repair is done for both PC and Mac,

Here's how to run the repair on PC Companion:
1. Install and open PC Companion then select Support Zone.
2. Phone Software Update.
3. Start.
4. Repair Phone
5. Continue
6. Accept data removal
7. Next
8. Wait for prepare
9. Select Phone
10. Follow the connection steps

And Bridge for Mac:
1. Launch Bridge for MAC without the handset connected.
2. On the Main Window select "Xperia > Repair Xperia Device".
3. Ensure the phone is charged and select "Ok" in the following window.
4. Select Continue on the following page.
5. Wait until the initialising step is finished the continue as below.
6 . Select your model of phone from the list that appears
7. Follow the connection steps that appear, ensuring that you are holding the relevant button down before during and after the connection phase until the update/repair begins.

[Horia1]

I have followed the instructions with Bridge for Mac. It took about 20 min the reformatting of the system and 4 min the restarting of my Sony Xperia Dual D6633. Still my phone doesn't find anymore any network. 

Please advice. Thank you!

PS: My SIM cards are OK because are functional on other phones.

[emk]

My comment might be so naive
Go to settings > dual sim settings >make sure that your sim card is checked on (enabled)

[Horia1]

I have enabled, disabled and enabled again tens of times in settings, stil nothing.

[emk]

Try repair your device using pc companion