Xperia xa1 ultra bad signal

[LouShiny]

I bought Sony xa1 ultra after seven days I realised I got signal problem I compared Sony C3 Z4 and vivo phone they have a better signal than to my new Xperia XA1 ULTRA

For the first time in my Sony experienced in this phone I have a problem with your quality 

[Biloute80]

Translation via Google translate:

The signal is really disgusting always to bug and disconnect I was with a Samsung J7 which was worth half the price of it and frankly at the connection level never worries if I had known I would have kept it disappointed

Le signal est vraiment dégoûtant toujours à **bleep** et se déconnecter j'étais avec un Samsung J7 qui valait la moitié du prix de celui ci et franchement au niveau connection jamais de soucis si j'avais su je l'aurais gardé suis déçu 

[LouShiny]

You will never know until you have it, Sony should change the phone with the better one