QR Code SMS generation - different behavior on iPhone vs Android

Hi!

I'm generating QR codes for SMS messages in PHP, but I'm struggling with platform differences. I want to pre-fill only the message body, letting users choose their own recipient - but different platforms behave weirdly.

What I've Tested:

Format: sms:?body=message (no phone number)
- ✅ iPhone: Perfect! Empty recipient, message pre-filled
- ❌ Android: Opens Notes app instead of SMS (wtf?)

Format: sms:+48123456789?body=message (with number)
- ✅ Android: Works perfectly
- ❌ iPhone: Shows annoying "Add to Contact" popup

Format: SMSTO:+48123456789:message (with number)
- ✅ iPhone: Works well, but requires phone number
- ✅ Android: Also works, but requires phone number

My Current PHP Code:

// What I want to achieve:
$qr_content = "sms:?body=" . urlencode($sms_body);  // iPhone ✅, Android ❌

// What works but requires number:
$qr_content = "SMSTO:+48123456789:" . $sms_body;    // Both ✅, but I don't want number

QRcode::png($qr_content, $filepath, "M", 8, 2);

My Goal:
Generate QR codes that open SMS app on both platforms with:
- ✅ Pre-filled message body
- ✅ Empty/no recipient (user adds their own)
- ✅ No "Add to Contact" popups
- ✅ No wrong apps opening (looking at you, Android Notes!)

Questions:
- Is there a universal format for SMS without phone number?
- Why does Android open Notes for sms:?body=?
- Any workarounds or alternative approaches?
- Should I detect user agent and serve different QR codes?

Has anyone solved this cross-platform SMS QR puzzle? Any help appreciated! 🙏

Environment:
- PHP 7.4+
- QR libraries: phpqrcode or chillerlan/php-qrcode
- Target: iOS Safari & Android Chrome

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