@edika99 , We are not aware of any restrictions regarding telephony in Italy.
We recommend that you save all contacts on your phone with the country code (example 0041). If you have saved the numbers with the country code (example 0041781234567), errors will be avoided. How the routing is set with the foreign provider, if you dial a number without country code from your memory, we cannot tell you.
Concerning the accessibility, you were only 20 times reachable out of 100 attempts, we did not get any restrictions from the Italian providers.
You are welcome to call +41800668866 from abroad on your next visit and discuss your request directly with our technical support.
Greetings
Daniele