I can not enter my iphone and Unable to actiavte

"I can not enter my iphone and Unable to actiavte: I cant access my device"

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Thank you for the screenshot.

Troubleshoot "Unable to Activate":

A. Start Here: If you can't Activate your iPhone - Apple Support

As it Reads: "If your iPhone can't be activated or an alert says the activation server is unavailable or the SIM card is unsupported, learn what to do."

B. Install a Cellular Update:

Your device is quite old. So, that may be the culprit. But, before making that assertion, try the following. It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Suppor