[HTC Sensation] Elvis_Freshly:
And I work for T-Mo and its 14 days for upgrade/contract extensions...30 day buyers remorse for new activation's.

I will provide you our policy verbatim here at T-Mobile. See Below and this will answer ALL questions.

If you recently purchased a new T-Mobile phone

You have 14 calendar days (30 in CA) from the date of purchase to return purchased equipment to the point of purchase where you purchased your device from. Equipment must be in good working condition with original contents and packaging to be eligible for a refund of the purchase price. This return policy applies to the purchase of new equipment from T-Mobile or its authorized dealers. Proof of purchase is required. We may charge a restocking fee. A different return period may apply to accessory purchases. Prepaid cards, software, or games are not refundable.

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If your phone is defective and still under the manufacturer warranty

If your phone is defective and still under manufacturer warranty, you can return it directly to the manufacturer. T-Mobile can assist you by providing you with a replacement phone and submitting your phone to the manufacturer for you. This is a service that T-Mobile provides as a supplement to the manufacturer warranty that may come with your phone.

If you would like T-Mobile to provide you with a replacement phone and to send your defective phone to the manufacturer for you, contact Customer Care to order a replacement. Please note that when you call, Customer Care will first attempt to troubleshoot your phone issues. For this reason, please make your initial call to Customer Care from a different phone or you may limit the ability to troubleshoot.

Once you receive the replacement phone, you must return the defective phone to T-Mobile to complete the exchange.

To receive a replacement phone in advance from T-Mobile, you must agree that we may charge you an out of warranty fee (Out of Warranty Fee) for the value of the equipment if your phone is found to be outside the manufacturer warranty period and/or is physically damaged in a manner not covered by the manufacturer’s warranty. You will only be charged the Out of Warranty Fee if, after T-Mobile has received your phone and inspected it, the phone is outside the warranty period or is otherwise defective in a manner not covered by the manufacturer warranty, as described below.

IMPORTANT: Customers can return devices directly to the manufacturer if they do not want to participate in T-Mobile’s phone replacement program. Those customers who elect to participate in this program must agree to pay an Out of Warranty Fee of up to $300 (depending upon device model) if their original phone is ultimately determined not to be covered by any manufacturer warranty.

Customers can contact T-Mobile Customer Care for the Out of Warranty Fee for their particular device.

NOTE: Customers who purchased devices under our Refurbished Device Program can also participate in T-Mobile’s phone replacement program if their phone is still under T-Mobile’s 90 day limited warranty. You must agree to that we may charge you an Out of Warranty fee if your refurbished device is found to be outside the limited 90 day warranty period and/or is physically damaged in a manner not covered by the T-Mobile 90-day limited warranty.

When receiving a new replacement phone, you have two available shipping options:

UPS Ground shipping ($9.95 plus any applicable tax) for delivery within seven business days (unless the item ordered is on backorder).

UPS Express shipping ($19.99 plus any applicable tax) for delivery within three business days (unless the item ordered is on backorder) excluding weekends and holidays. UPS Express shipping is not available to PO Boxes, Military addresses that contain APO AE, or prepaid customers.