T-Mobile 535 - Manual (Page 18)

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Step 2
Select Remove connection for new ME adding option.
Press Next.
Step 3
Select the connection you want to remove from the list and press
Finish.
Step 4
Press Close.
Note: Considering the limitations inherent in some Windows
versions, the removed APN will be available for existing devices
until you remove the particular device and add it again (see
Section 8).