How many are there in a book? extagen dosage T-Mobile is the exclusive carrier for the Xperia Z in the U.S. and will start pre-orders July 16. The phone comes in black or purple. If you purchase it from T-Mobile, it will require a downpayment of $99.99 and 24 equal monthly payments of $20. Alternatively, you can purchase it from Sony for zero down and $25 per month for 24 months on your Sony credit card. You can also just plain pay $579.99 for it. (Yes, this mess of numbers makes our heads spin a bit, too. When did purchasing a phone get to be so complicated?)