Why am I not receiving the confirmation SMS or alerts SMS?

[MatBav]

Hey guys, I hope you're doing well, 

I didn't receive the SMS verification code or SMS alters on the Splunk on-call product. My team across the world (US, Brazil, Ecuador) are receiving SMSs but I'm (from Paraguay) not receiving the SMS. The phone zone code for Paraguay is +595 and a complete phone number should be +595 XXX XXXXXX.  I tried with two different phone numbers.

Do you have any suggestions? 

Thanks,