I have an iPhone 7 and get an unable to activate because the server is temporarily unavailabe.

Hello redalertssi,

You say:

"unable to activate because the server is temporarily unavailable."

"If your iPhone can't be activated or an alert says the activation server is unavailable [or cannot be reached] or the SIM card is unsupported," read this support article to learn what to do. "If you can't activate your iPhone [or iPad]" - click here --> https://support.apple.com/HT201407

redalertssi Said:

"I have an iPhone 7 and get an unable to activate because the server is temporarily unavailable."

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A Couple of Thoughts:

Try this later on. Perhaps the system is down at the moment for security update installations and other configurations.

Also, visit the link provided atop this post.