SMS Developer & Telecom Utility Suite
Production-tested utilities for telecom developers, carrier engineers, and QA teams. All calculators execute client-side with zero telemetry leakage.
GSM-7 / UCS-2
SMS Segment Calculator
Calculate exact GSM-7 vs UCS-2 character boundaries and estimate per-segment carrier transmission charges in real time.
Twilio / Telnyx / Plivo
SMS Webhook Payload Validator
Validate inbound SMS webhook payloads against Twilio, Telnyx, and Plivo API specifications and inspect normalized schema.
E.164 / RFC3966
Phone Number & E.164 Formatter
Convert national phone numbers into international E.164 and RFC3966 URI standards required by carriers and developer SMS APIs.
CTIA Diagnostic
SMS Delivery Troubleshooter
Identify why verification passcodes or automated messages fail to arrive across carrier spam filters and A2P 10DLC campaign rules.