A couple of hours ago I registered in Manna, the process is easy, but it has not been possible for me to verify my cell phone number; I have a couple of hours for the verification code to arrive. I will keep trying.
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Thanks.
Contact their support. They also have a Telegram channel where support looks really good. https://t.me/Manna_Currency
you can not use a voip must be a US carrier or landline to verify. also check text messenger