About Phone Verifications
All phone carriers participate in an international database that contains every phone number currently in use. The phone carriers will report each number type: mobile, landline, or VOIP (VOIP = Voice over Internet Protocol or when you use your internet connection for phone calls). When you upload your CSV, GetThru will compare every number in that CSV and report on what type of number each phone number uploaded is. If it is textable or callable, we will mark it as valid, and if it isn't, we will mark it as invalid.
In ThruText, you can only text mobile numbers. If a phone number is a landline or VOIP, it will be marked invalid. This might cause confusion due to some VOIP numbers offering the ability to send and receive texts (such as Google Voice). While those carriers exist, most VOIP numbers are in use to replace landline numbers and do not accept SMS. To keep deliverability high and save your costs for undelivered messages, we don't allow texting of VOIP numbers.
In ThruTalk(New), landline and VOIP numbers that are not textable are dialable and will be included in the valid count in the group's ThruTalk(New) totals.
The Group page has a breakdown of phones for ThruText and ThruTalk:
How to Verify Your Phone Numbers
To verify your group data, export your group as a CSV. Read more on group exports here.