The residents of eastern Iowa are getting used to dialing the new area code 5-6-3. The “grace period” started earlier this year and allows people using the old 3-1-9 code to be automatically transferred. Rob Hillesland, spokesman for the Iowa Utilities Board, says not may problems have been reported.Hillesland says business and industrial customers need to check and make sure the switches in their equipment had been updated.The grace period lasts until December 1st. Starting December 2nd, the 5-6-3 area code will be mandatory.