Hi @Siewwoon ,   We are sad to klnow that you're having issues sending SMS while on the roaming status. We did an article that you may find helpful, please see the link below.    International roaming troubleshooting guide    Let me know how it will go.   Cheers!   @Siewwoon wrote: I can receive sms while on roaming but I am not able to send one. Please advise how to do it? I have already top up my account balance to use services that is not originally covered in my sim only plan.   ... View more