Riordan said the company expects to restore all services sometime this week. Cellcom said Monday it restored Short Message Service (SMS) texting and Cellcom-to-Cellcom phone calls. "Every part of this recovery is being handled with care and precision — we will not rush anything that compromises safety, security or trust," Riordan said in the letter. Riordan also shared a public message with Cellcom customers, which you can watch here.