Reuters is reporting that both Cingular and T-Mobile have halted sales of the popular Motorola Razr cell phones because of a technical problem that is causing the phones to drop calls in mid-stream. Motorola has admitted to the defect, but maintains only a small number of the phones are affected by the problem. Representatives from both Motorola and T-Moble said they expect Razrs to be back on the shelves by early next week.