a2mobile WiFi Calling

The Wi-Fi Calling a2mobile application allows you to make voice calls using Wi-Fi networks as part of using the "WiFi Calling" promotional offer. The condition for using "Wi-Fi Calling" is to have a registered and active SIM card in the a2mobile service, read the "WiFi Calling Application Rules" and the "WiFi Calling" promotional offer, accept the terms and obligation to follow them, download and installing on a compatible device in accordance with the rules described in the promotional offer described on the a2mobile.pl website.

Talk over Wi-Fi where there is no cell coverage, but there is Wi-Fi coverage.
In a2mobile, commercially for the first time in Poland, you can use Wi-Fi Calling - calls via Wi-Fi, using your phone number.
Wherever you have access to Wi-Fi - whether in your home or in your favorite club, and especially where there is no coverage of four networks - you can talk as you usually do.

For incoming and outgoing voice calls made via the WiFi Calling application in a2mobile, you will be charged according to the A2mobile Telecommunications Services Price List, as per incoming or outgoing calls on the Aero2 network in Poland. Fees are charged from the User Account during the call. Calls made as part of the WiFi Calling service count towards your minutes in Call Packages for making calls in the country.

The above conditions of using the service do not include charges for receiving international roaming calls within the following countries: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Greece, Spain, Ireland, Iceland, Liechtenstein, Lithuania , Luxembourg, Latvia, Malta, the Netherlands, Germany, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Sweden, Hungary, the United Kingdom, Italy, beyond the reach of the Wi-Fi network. In the case of such connections, received outside the reach of Wi-Fi networks, you will be required to pay for calls received in international roaming, according to the a2mobile tariff list you use.
For calls to foreign numbers made via the Application in the WiFi Calling service you are charged as for calls made from Poland abroad, according to the applicable a2mobile Price List, which you use.

Everything from your phone number.