Guides
How to check if a phone number is active (and what "active" really means)
Valid, active, reachable and registered mean different things. The methods for checking each one, what they cost and where every method falls short.
7 min read
Articles tagged “Number reachability”
2 articles.
Deliverability
SMS delivery receipts vs HLR lookup: before or after you send
A delivery receipt reports what happened after you sent an SMS. An HLR lookup asks the network before you send. What each can see, miss and cost.
7 min read
