Stop paying to verify duplicates and malformed numbers: a preflight before paid processing
If you buy lists or export CSVs from a CRM/dialer, you know the pattern: the file looks clean in the spreadsheet, and the waste only shows after you pay per-record to verify it - or after your first send fails.
Before any paid verification, four cheap checks catch the records you should never pay for:
1. E.164 format - is the row even a phone number? Missing country codes, letters, or truncated rows fail here first. They cost nothing to remove before processing.
2. Deduplication - is the same contact in the list twice or three times? If you pay per lookup, duplicates are pure waste. A 50k file with 8% duplicates means 4,000 records you pay for twice.
3. Line type - mobile, landline, VoIP or premium-rate? This decides whether SMS/WhatsApp is even possible. Sending SMS to a landline is not a deliverability problem - it was never a candidate.
4. Registration signals - is the number actually registered on the channel you plan to use (WhatsApp/Telegram/iMessage/RCS)? A perfectly valid mobile can be unregistered on WhatsApp and will fail before your message is even queued.
Practical habit: run a 500-1000 row sample through those four checks before you commit the full file. Format + dedupe alone often kill 10-20% of a broker's list. If that sample is dirty, the rest of the file will be too - useful information before you pay or negotiate.
Example: 100k broker file where 12% are malformed, 8% are duplicates and 18% are landline/VoIP when you only wanted mobiles for WhatsApp - that is 38k records (38%) you would have paid to verify and then failed to use. Catching them in a free preflight changes the economics of the campaign.
If you are cleaning phone/email lists before you route, import or send, you can check the available verification workflows at
- but the habit matters more than the tool: check before you pay to process, not after.
How do you handle a broker list that turns out 30%+ junk after you have already paid - refund, re-process, or just eat the cost?
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