Group Size Details

We recommend keeping your groups to 50k contacts or less. 

File Size & System Warnings

The first reason to watch your group size is that huge files will cause the system to time out. Currently, the threshold for groups timing out is 50,000 rows. You will see an error if your file is larger than 50K. If you are using a VAN external contact list, reduce the length of the list in VAN before re-attempting.

In addition to the number of rows in a file, the number of columns also impacts the file size. If you encounter an error while uploading a group, remove all unnecessary columns before attempting to upload the group again.

Local Phone Number Supply

The other reason to monitor group size is that ThruText messages and ThruTalk calls originate from local cell phone numbers that we obtain via a third-party provider. During the campaign creation process, you specify up to 3 area codes or regions from which you want those local numbers to be obtained. Third-party providers have a limited supply of phone numbers for each area code. In ThruTalk (and ThruText campaigns outside the US,) when you target a campaign to a large group, they may have insufficient phone numbers in the 3 area codes or regions you select. The shortfall of numbers will cause the campaign not to launch and display a message indicating that insufficient numbers are available.

NOTE - To ensure high system performance, a new process is being implemented that will limit the number of allowed concurrent group uploads per account. Please reach out to with any questions regarding your account's limit.