Will telecom carriers block or flag my SIM card for sending SMS?

Carriers flag SIM cards when they detect burst traffic or receive user spam complaints. ApnaSandesh enforces a 3.5s to 6s safety throttle between sequential dispatches and automatic opt-out suppression to keep your SIM in complete compliance.

Why is there no cloud dashboard or web login?

By keeping ApnaSandesh 100% on your Android device in a local Room SQLite database, we eliminate server operating costs, avoid user data leaks, and ensure the app works even with mobile data turned off.

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Interactive Telephony Utility

GSM-7 vs UCS-2 Encoding & Segment Forecaster

Test any message template against real cellular carrier encoding limits. Understand how single emojis or Hindi characters cut your message capacity from 160 to 70 characters.

Telemetry & Telephony Engine

Live GSM-7 and UCS-2 segment calculator

Encoding: GSM 7-bit (Standard)

Message text composition140 characters (1 SMS segment)

Total characters

140

160 chars/single

Segments / contact

Single part

Cloud gateway cost

₹0.28

Per single recipient

ApnaSandesh SIM cost

₹0.00

Uses phone cellular plan

Annual financial difference

Estimated savings across your customer list

Recipients:

Annual budget saved with on-device ApnaSandesh

₹17,760 / year retained

Based on 1,000 monthly recipients (1,000 billable segments) vs Twilio/Exotel gateway markups + platform subscriptions.

Zero cloud lock-in

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GSM 7-BIT ENCODING STANDARD

160 Characters per Segment (153 if Multi-part)

Standard Latin characters, numbers, and basic punctuation are packed into 7 bits per character. A single message payload holds 140 octets (1,120 bits), allowing exactly 160 characters. When concatenated into multiple segments, 6 bytes are reserved for the User Data Header (UDH), reducing per-segment capacity to 153.

UCS-2 16-BIT UNICODE PENALTY

70 Characters per Segment (67 if Multi-part)

Inserting a single non-GSM character (such as Devanagari script, accented letters, or emojis) forces the mobile handset and SMSC switch into UCS-2 encoding. Each character now consumes 16 bits, instantly slashing the per-message limit from 160 to 70 characters.