If you know – or even think that you know – someone that may have been affected by the terrorist attack at Turkey’s Atatürk Airport in Istanbul yesterday, then the big four carriers in the U.S. are offering free calls to the country. It’s a shame that this kind of offer is necessary, but it’s good to know that in times of need carriers can put their differences aside and band together to help those that need it.

Here are the details:

• Verizon is offering free calls and texts from mobiles and free calls from a fixed line until June 29 (inclusive). You’ll still incur “applicable taxes and surcharges” though.
• AT&T is offering free calls and texts to Turkey from mobiles and free calls from landlines until June 30 (inclusive). It includes both GoPhone and Postpaid customers.
• T-Mobile is offering free calls and texts until July 5 on its own network (pre-and post-paid) as well as for MetroPCS, GoSmart Mobile, and WalMart Family Mobile customers.
• Sprint is offering the same deal: free calls and texts until July 5 on its network and subsidiaries (Boost Mobile, and Virgin Mobile). The offer applies to both pre- and post-paid customers and roaming charges will be waived for those in Turkey calling the U.S..