Our customer knows they’re getting started, so
“To get started” is not necessary.

The most significant word in this sentence is primary, so it should appear earlier in the instructions.

It’s obvious this is where the customer enters their number, so we don’t need to label it Sprint Mobile Number.

Rather than say the passwords are separate, it is clearer (and more helpful) to say the accounts are separate.

The words your and My are confusing right next to each other. Proper phrases read more easily in bold.

Heading and copy are redundant.

Temporary password implies the customer will eventually change it to a permanent password, whereas verification code reinforces the purpose of this step: protecting our customer’s identity.

The first sentence sounds patronizing. People know a typo in their address will prevent them from receiving email.

Important can sound bogus. We don’t want our customer to think we might spam them.

Address is not needed; no hyphen in email.