U.S. model phones are covered under a U.S. warranty. That warranty may or may not be valid in Spain. You need to consult your warranty documents. If you want to make a warranty claim -- this forum is not how you do it.
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When you installed the new router, did you give it the exact same SSID (network name) and password as your old router had? People do this thinking that it will save them time because their devices wont need to be reporgrammed, but the problem is they can have issues with connectivity because even though the new wireless has the same name and password as the old one it really isn't the "same" network. Also, if you have a dual-band router, make sure the 2.4 ghz network and the 5 ghz network do not have the same name. They can be the same and have one say "5g" at the end, I just mean, if your network name is "MyWifi", don't have them both set to "MyWifi" with no differentiation between the two. I recommend you: 1) "Forget" the wireless network on your phone (which deletes the saved settings profile on the device). 2) Reboot your wireless router (unplug power for 30 seconds), regardless of if other devices are having no issues. 3) Reboot your phone. 4) Try to connect again to the network from scratch (you'll have to reenter your wireless password).
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