How Do I Get My Old Number On To My New Sim

my son lost my new sim and i have important numbers in it

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Mobile Number Change FAQs
... current voicemail box; I do I forgot my new mobile number, is no guarantee that you with a mobile number change . To have my old number back, what do ? R50; When can I choose my new mobile number? Is there a cost associated with your number changed my mobile number and now I want to have your T-Mobile mobile number. R50; Your service agreement terms will...
myFaves® (T-Mobile Dash™)
... myFaves *Additional charges may be US domestic numbers (not including toll-free or 900 numbers). Calling myFaves contacts R50; Adding a new contact IMPORTANT: Contact names and icons may apply. To add a new contact, perform the following steps: Edit profile Edit contactR17;s name and number. Type the contactR17;s name and number (must be changed once per calendar month...
Prepaid Important Service Information
...and you will be separately charged for lost . Wireless service Coverage is not compatible...Important Service Information Album FAQs T-Mobile Prepaid Sidekick® FAQs Phone return and replacement policy FAQs You agree to change. You realize that you will get a new number...restricted to another handset or SIM Card. Cards may require a new SIM card. Applicable taxes and fees...