diff -Nurp linux-source-2.6.28.old/drivers/usb/serial/option.c linux-source-2.6.28/drivers/usb/serial/option.c
--- linux-source-2.6.28.old/drivers/usb/serial/option.c	2009-06-02 14:57:13.000000000 +0700
+++ linux-source-2.6.28/drivers/usb/serial/option.c	2009-06-24 02:39:56.000000000 +0700
@@ -292,6 +292,7 @@ static int  option_send_setup(struct tty
 #define ZTE_PRODUCT_MF628			0x0015
 #define ZTE_PRODUCT_MF626			0x0031
 #define ZTE_PRODUCT_CDMA_TECH			0xfffe
+#define ZTE_PRODUCT_AC2726			0xfff1
 
 #define BENQ_VENDOR_ID				0x04a5
 #define BENQ_PRODUCT_H10			0x4068
@@ -511,6 +512,7 @@ static struct usb_device_id option_ids[]
 	{ USB_DEVICE(ZTE_VENDOR_ID, ZTE_PRODUCT_MF626) },
 	{ USB_DEVICE(ZTE_VENDOR_ID, ZTE_PRODUCT_MF628) },
 	{ USB_DEVICE(ZTE_VENDOR_ID, ZTE_PRODUCT_CDMA_TECH) },
+	{ USB_DEVICE(ZTE_VENDOR_ID, ZTE_PRODUCT_AC2726) },
 	{ USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_H10) },
 	{ USB_DEVICE(0x1da5, 0x4515) }, /* BenQ H20 */
 	{ } /* Terminating entry */