Exhibit 10.1

Sprint - Finance

Mailstop: KSOPHF0410-4A427

6200 Sprint Parkway

Overland Park, KS 66251

March 4, 2013

Ryan Siurek

6480 Sprint Parkway

Overland Park, KS 66251

Dear Ryan:

I am pleased to inform you that you have been selected to receive a special cash retention award.

This retention award consists of two payments totaling $132,500. You will vest in your award 50% the earlier of 1) the Sprint-SoftBank transaction closing, or 2) October 31, 2013. The second 50% will vest one year after the date the first payment vests. Payments will be made as soon as administratively practicable following vesting.

Additional terms of award payment -

• Involuntary termination without cause:

◦ In addition to your severance package, if your employment is involuntarily terminated without cause, you will receive the entire award payment as soon as administratively practicable after termination.

• Termination for any other reason:

◦ If you have a termination of employment for any other reason (including voluntary termination, acceptance of a voluntary separation package, termination for cause, or unsatisfactory performance), you will forfeit any unpaid retention award payments in their entirety.

I look forward to your ongoing contributions.

Best Regards,

Joseph J. Euteneuer

Chief Financial Officer