I had a similar situation late last year we were apart for 90 days, not phone, no email, nothing. I’m not gonna lie, it was tough – very tough.
I kept myself sane by writing to him every single day. I wrote everything that was on my mind and told him how much I miss him and love him. I also kept myself busy so I didn’t dwell on it too much. I don’t know if this is possible for you, but I created a document in Google documents that I added to every day. I gave him the name of the document and the password to my account so he could look in on it when he felt like it and was able to.
Another thing we did was agee to say the same prayer every day at the same time, it was kind of like our moon and we both knew at that very moment that we were both focused 100% on the same thing.