Alltel is celebrating the second anniversary of its MyCircle calling plan. Those customers who are also marking their second anniversary of using the plan will receive a bonus number. So, those who have a circle of 10 will now be able to expand that to 11, and 20 will go to 21. The extra number will be free of charge. Alltel also said that from now on, every two years, MyCircle plan subscribers will be able to add a bonus number. The number can be added to your circle by accessing your Alltel account online.