NOTE: Make sure your Bot Phone and your personal phone have free data roaming or these steps will end up being very costly.
To lock a Bot Phone to a specific carrier, reach out to the MarkSetBot Support team at +1 855-627-5738. We are able to force your devices on to any network that is supported with your plan.
To lock your own device on a specific carrier, you will need a plan that supports Manual Network Selection or Manual Carrier Selection.
For Android Devices
Once it is enabled, you will be able to go to Settings>Network>Mobile network>Advanced and have a section that lets you turn off automatic selection and pick a network. On older phones this feature takes a fair bit of time to search (as much as 5 minutes). If the search fails, you may need to reset your network connections in the phone.
For iPhone Devices
Once it is enabled, you will be able to go to Settings>Mobile Data>Network Selection>Enable Manual Network Selection and pick a network. On older phones this feature takes a fair bit of time to search (as much as 5 minutes).
** If you are in the US and using AT&T, here is the process we've found. Call support, ask for international support, and then ask for ATS (Advanced Technical Support) team. The change takes them a few minutes.