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Hello
I had just bought an Xperia xa1 ultra and can't get it to connect to my network I put new sim card in it and still shows no sim card me and my carrier has tried everything to get it to connect but it won't. All help would be very appreciated thanks
Hi @9696
Welcome to the community!
Sorry to hear about that 
First of all, it may sound silly but make sure that you have inserted the SIM card the prescribed way into the correct slot. You can look up the correct way to insert your SIM card in the user manual for your Xperia device. You can check the online user guide for your product on www.sonymobile.com/global-en/support/ - just select your product and click Online user guide.
If you have converted your Mini SIM card to a Micro SIM by stamping it out the SIM card might be defective due to this process. Please test out an original SIM card in your device to rule out that possibility. Note, that testing the punched out SIM card in another device does not rule out a defect, as different devices might react differently to a defect of the SIM card.
Also, check if your device works with another SIM card since your SIM card might be defective. Testing your SIM card in another device does not rule out a defect of the SIM card, as different devices might react differently to a defect of the SIM card.
As your SIM card is new, make sure that your SIM card is activated. Contact your network operator if you are not sure if your SIM card has been activated or not.
Give the above steps a try and let me know how you get on 
I actually finally got it resolved I done a lot a research and found something silly and tried it and it worked I put a folded piece of paper under sim card to lift it up a little and now it work I appreciate the help
Hi @9696
Great to hear it's working, however we generally wouldn't suggest putting foreign objects such as paper in the phone as it could cause issues later on.
If you get the chance I would advise contacting Local support as it sounds like this is a hardware issue that would need repair 