Phone authentication send code not received for US(+1) numbers

Hi,

We have wonder about this issue that, We are using REST API to send the aggrement with phone Identity, we have send the code using text message but not receiving the code, This problem only for US(+1) number when I am using other country mobile number like india(+91) then I can received the code. Also We received the code when I choose voice call for US number, Please kinldy take look at this issue or please share your feedback answer.