Airtel and Idea both are providing Huawei E5573s-606 and E5573cs-609 in India. Both these devices can be unlocked after changing the firmware. By default E5573s-606 also allows you to change the APN, but E5573cs-609 APN field is not editable. Means after unlocking of the device also, you can not use any other network provider SIM card.
Earlier we had provide a post to create a new profile in E5573s-606 and E5573cs-609 through Smartphone. Now, without smartphone, adding APN or profile is also possible. The procedure is described in this video: