NTT DoCoMo has published a detailed map that shows their service status of Tohoku area. As their usual way, it is TOO detailed and a bit hard to understand because of it, but basically, grey shows the no service area, and blue is the temporary service area with mobile cell sites. DoCoMo service recovery map, 3/22
According to the chart below, current unfunctional cell site number is down to approximately 600-700 in Iwate, Fukushima and Miyagi prefectures.
Source: DoCoMo press release 3/22
Michi