When you try to add funds, you receive an error message. This error usually comes up when SMS.to payment portal detects several failed payment attempts. If you are using a credit card when processing the payment, please contact your credit card company to check if there are any restrictions on your account. There are credit cards with restrictions on processing international payments. 

If your card does not have international restrictions, please try to process the payment again after 24 hours. 

If you are still getting the same error after 24 hours, please send an email to support@sms.to