Getting Started

What is the difference between A2P and P2P SMS?
A2P and P2P messaging are broadly categorized on the type and volume of traffic that is being sent. A2P (Application to Person): In this type of messaging,...
How can I find out the reason for Outbound SMS Delivery Failure?
SMS error codes are sent at each stage of the delivery process. Depending on the message_state returned, an accompanying error_code may be given. That is, i...
Difference between Promotional and Transactional SMS?
Promotional SMS: SMS’s that are sent with the objective of promoting a product/service. These usually includes sales & marketing SMS’s which may or may...
Powerpack for SMS
Sending SMS messages using regular 10-digit phone numbers (aka long codes) is heavily regulated in the US and Canada. Long codes, however, remain the medium...
Enhanced Destination Number Validation for SMS
The platform now has the capability to identify invalid and non-SMS enabled destination numbers, and also fix incorrect formats of destination numbers which...
Introducing Incoming Message Content And Source Number Redaction
We’ve introduced an application level flag to control whether message content and source numbers of incoming messages to Plivo phone numbers should be redac...
Why are we charged for Undelivered SMS or SMS which are in Sent/ Delivered state but never reached the destination mobile number?
Plivo is a Pay-As-You-Go API platform. Plivo relies on its extensive carrier network to deliver messages successfully. In some cases, messages may be sent f...
What happens to my outbound messages if I don't have sufficient balance in my Plivo account?
Outbound messages will go into a "Failed" state with Plivo error code 900 and are not forwarded to our downstream carriers. Post this, for the nex...
Upcoming Changes To Long Code SMS in US
Update [May 17, 2019] Verizon has pushed ahead the launch of its new A2P Long Code SMS product.  We are awaiting further information from Verizon on th...
Can I reply to customers who have opted-out ?
Mobile subscribers who reply with "STOP" messages to your Plivo number are considered opted-out and any subsequent SMS to these phone numbers are ...