Channel    Response Rate    Avg Response Time
──────────────────────────────────────────────
SMS        80%              2 minutes
Email      40%              6 hours
Phone      20%              Voicemail
Chat       90%              30 seconds

Inference: Prefers real-time text (SMS/chat)

SMS: Short, quick responses
Email: Detailed, thoughtful replies
Phone: Rushed, distracted

Inference: Prefers async written communication

SMS responses: 7am-9am, 6pm-9pm (personal time)
Email responses: 10am-4pm (work hours)
Phone answers: Never

Inference: Work-personal separation, respect boundaries

Score each channel 0-100:

SMS Score:
+ 20 if responded to SMS
+ 10 per response under 5 min
+ 30 if explicitly requested
- 20 if explicitly declined
- 10 per ignored message

Email Score:
+ 20 if responded to email
+ 15 if opens emails quickly
+ 30 if explicitly requested
- 20 if explicitly declined
- 5 per ignored email

Phone Score:
+ 30 if answered call
+ 20 if returned call
+ 30 if explicitly requested
- 30 if sent to voicemail
- 20 if explicitly declined

{
  "prospect_id": "12345",
  "channel_preferences": {
    "primary": "sms",
    "secondary": "email",
    "avoid": ["phone"],
    "scores": {
      "sms": 85,
      "email": 60,
      "phone": 15,
      "chat": null
    }
  },
  "timing_preferences": {
    "best_days": ["tuesday", "wednesday", "thursday"],
    "best_hours": "9am-11am, 2pm-4pm",
    "timezone": "America/Los_Angeles",
    "avoid": "mondays, after 5pm"
  },
  "communication_style": {
    "formality": "casual",
    "length_preference": "brief",
    "response_expectation": "quick"
  },
  "last_updated": "2024-01-15",
  "confidence": 0.8
}

SMS → Email:
"Hi [Name], I've been trying to reach you by text.
Sending this email in case that works better for you."

Email → SMS:
"Hi [Name], just sent you an email with the details.
Texting in case you see this first—let me know if you have questions!"

Email → Phone:
"Hi [Name], I've sent a couple of emails about [topic].
Would it be easier to jump on a quick call? I can explain in 5 minutes."

If prospect said "Don't call":
- Never initiate calls
- If they call you, that's okay
- Don't pressure about phone

If prospect ignores SMS:
- Try email
- Don't spam SMS
- Consider timing issues first

❌ Bad:
10:00 AM - Send email
10:05 AM - Send SMS
10:30 AM - Call

✓ Good:
10:00 AM - Send email
(Wait 24-48 hours)
10:00 AM - Send SMS follow-up
(Wait 24-48 hours)
10:00 AM - Try call if still no response

When prospect responds on SMS:
- Acknowledge you sent email too
- Don't require them to check email
- Summarize email content if needed

"Got your text! I also sent more details to your email,
but happy to cover it here if that's easier."

"Hi [Name], quick question—still looking to solve [problem]?
If so, I have an idea that could help. Worth a 10-min chat?"

Subject: Idea for [Company]'s [problem]

Hi [Name],

I've been thinking about the [problem] you mentioned...
[2-3 paragraphs of value]

Would you have 15 minutes this week to discuss?

Best,
[Rep]

"Hi [Name], it's [Rep] from [Company]. I sent you an email
about [topic] and wanted to follow up personally.
Give me a call back at [number] when you get a chance."

Preference confidence decays over time:
- Last 7 days: Full weight
- 8-30 days: 80% weight
- 31-90 days: 50% weight
- 90+ days: 25% weight (re-evaluate)

Always log:
- How preference was determined
- When preference was set
- Explicit consent given
- Opt-out requests

Test: New prospects, no preference data
A: Start with email
B: Start with SMS

Measure:
- Response rate
- Time to response
- Conversation quality
- Conversion rate