Before launching your first SMS campaign in Mailpro, you need to import your phone list correctly. Follow these steps to ensure every message gets delivered without errors.
Pro tip: Phone numbers must be in MSISDN international format (no "+", no spaces, no dashes). Example:
447911123456 for the UK.Prepare your file
- Open your spreadsheet (Excel, Google Sheets, Numbers).
- Create a column named Phone with numbers in MSISDN format.
- Add optional columns such as First name, Last name, Country to personalize your SMS.
- Save the file as .xlsx, .csv, .ods, .vcf.
Import the list into Mailpro
- Sign in to your Mailpro account.
- Go to Contacts → Import.
- Upload your file and map the phone column to the MSISDN field.
- Confirm the import — Mailpro will automatically validate each number.
- Assign a tag or list to segment your SMS campaigns.
Common mistakes to avoid
-
Missing country code:
7911123456won't work,447911123456will. - Extra symbols: strip out "+", "(0)", spaces and dashes before importing.
- Duplicates: Mailpro flags them so you can decide what to keep.
- Consent: only import contacts who opted in to receive marketing SMS.
Ready to launch your first SMS campaign?
Create a free Mailpro account and discover how easy it is to send personalized SMS to thousands of contacts. Start with Mailpro SMS · See SMS pricing
Related resources:
Complete guide: SMS marketing: how it works, rules and costs