ShopRite, Safeway and Kroger along with other grocery chains are serving mobile coupons via Verizon Communications Inc.’s new free digital coupon service.

The Kroger Co. has launched a loyalty program that rewards frequent shoppers with free minutes using the company’s own wireless phone service, branded i-wireless.

Kroger Co. has expanded its mobile coupon campaign to serve 2,200 of its grocery stores around the country after a successful test of 200 stores.