The monthly installments for my device vary
How are the installments calculated for device plans?
If you have opted for installment payments, you generally pay the costs of your device in 24 installments. The last installment is generally different. Therefore you pay amount A for 23 installments and amount B for the last installment.
Your bill shows which installment it is for each month.
For example: Installment 2 of 24 in the second month of your device plan.