EXCHANGE PREFIXES MOVING FROM AREA CODE 312 TO 773 ON OCTOBER 12, 1996

202 205 221 224 227 229 233 235 237 238 239 241 242 244 247 248 252 254 
256 257 260 261 262 264 265 267 268 271 273 274 275 276 277 278 279 281 
282 283 284 285 286 287 288 291 292 296 298 324 325 327 334 338 342 348 
356 363 371 373 374 375 376 378 379 380 381 384 385 388 395 399 404 429 
434 436 442 443 445 451 462 463 465 468 471 472 473 476 477 478 479 481 
483 486 487 488 489 493 506 508 509 521 522 523 525 528 533 534 535 536 
538 539 542 545 546 548 549 560 561 568 569 579 581 582 583 584 585 586 
588 589 594 598 601 602 604 622 624 625 626 631 632 637 638 643 646 650 
651 660 665 667 681 684 685 686 693 694 695 702 714 721 722 723 725 728 
730 731 734 735 736 737 741 743 745 752 753 756 761 762 763 764 767 768 
769 772 774 775 776 777 778 779 783 784 785 792 794 799 804 821 825 826 
834 838 843 846 847 854 862 863 864 866 868 871 873 874 878 880 881 883 
884 887 889 890 892 893 894 896 907 918 921 924 925 926 927 928 929 933 
935 947 948 955 961 962 967 973 975 978 981 985 989 992 994 995

ALL OTHER FORMER 312 EXCHANGE PREFIXES REMAIN IN THE 312 AREA CODE.

Permissive dialing period begins October 12, 1996.
Permissive dialing period ends January 11, 1997.

Test number: (773) 838-1204 gives recording if successfully dialed.

Source: Ameritech WWW pages.  Accuracy of sources not guaranteed.
Posted by: Pierre Thomson, Telecom Manager, CE Service