Good question you have.
I am looking now in Settings/More Networks/Mobile networks/Global Data Roaming Access/
- Deny data roaming access ( make this your default, unless you want data in Mexico, etc... )
- Allow access only for this trip ( do not choose )
- Allow access for all trip ( again, do not choose )
The above is NOT what you need, just mentioned it for FYI
I did a search for Roaming and the above is the only thing I could find AND that includes the Developer settings.
I suspect we do not have any control over which network is chosen.
I fully agree with your wish to avoid your own carrier in certain places as where I live we did not even have a Verizon cell site 3 years ago when I moved here. The other carrier signals were pretty weak in my house so I purchased a
Network Extender from Verizon. Plugged that into my DSL internet hub and whamo! I have local Verizon network in/around my home now.
In the last year though, my need for the Network Extender is pretty much a moot point. Verizon has saturated just about the whole entire area around me for 50 miles now.
In your work location, would it be cost effective, or worth while to purchase your own
Network Extender from Sprint and use it at work?
Sprint AIRAVE Wireless In-Home Signal Booster for Voice & Data