Military boyfriend said he would be "in the field", what does that mean?

Hi guys, My military boyfriend has been recently deployed. I am new to military life and we've he minimal communication since he deployed. He said he was going into the field for 2 weeks and would not be able to talk because he wouldn't have internet. I noticed he has been active on Instagram but I have not heard from him. What does in the field mean and can he have his cell phone?
Military boyfriend said he would be "in the field", what does that mean?
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