Welcome to Android Central! Do you mean that your phone has poor reception for your wireless carrier's signal (i.e., Verizon, AT&T, T-Mobile, etc.)? Or that the phone won't connect to the work wi-fi?
If you mean that your phone can't seem to connect to your wireless carrier, then what does the signal strength indicator look like? It's not uncommon for offices to have poor cell reception. Are you able to connect to your work wi-fi and use wi-fi calling?