Many major wireless carriers are offering free calls and texts in and out of Brussels after the attacks there that killed 30 on Tuesday.
The companies participating include AT&T (T), Verizon (VZ), T-Mobile (TMUS), Sprint (S), Virgin Mobile USA and Boost Mobile.
AT&T specifically said it will credit both landline and wireless customers for texts and calls from the U.S. to Belgium from March 22 to March 28.
"Our thoughts are with the people of Belgium and our customers who have friends and family there," the company said in a statement.
TELUS is waiving roaming and text charges for customers connecting both to and from Brussels through April 5. Those charges will be credited back to customers on a future bill, according to spokeswoman Emily Hamer.
Related: ISIS claims responsibility for Brussels attacks
Sprint, Sprint Prepaid, Boost Mobile and Virgin Mobile USA customers will not have to pay for voice and SMS while they are roaming internationally in Belgium. Sprint is also waiving international texts and calls from the U.S. to Belgium through March 31.
"This is an extremely difficult time for many of our customers who have friends and family in Belgium and need to keep in touch. We want to do what we can to show our support and comfort Sprint customers," Sprint CEO Marcelo Claure said in a statement.
Verizon is offering free wireless and wireline calling for people in the U.S., Belgium and also Turkey -- given the recent attack in Istanbul.
T-Mobile customers can also call free from Belgium, Turkey and the U.S., including Puerto Rico.
"I'm speechless. Our hearts are with everyone affected by the horrible acts of terrorism. Please take care of each other," T-Mobile CEO John Legere said in a statement.
