I would order a sim kit from Amazon, just to be safe. Otherwise, I would place the cricket order online on 6/17. Verizon should prorate your bill for the few days you're on it following the expiration of your contract.
Be sure to read and follow these recommendations. As long as vials or pens are stored unopened in the refrigerator (at 36 to 46 degrees Fahrenheit), they are good until the expiration date on the container. Questions about the insulin's potency start when you open the vial or pen and begin to use it.
Step 4. Protect your medication by packing your diabetes supplies and medication in a carry-on bag to keep you from losing your items. Ask if you can refrigerate your insulin while on the plane or store it in a thermos to keep it at a safe temperature. Keep any pills in a dry place to avoid moisture damage and never freeze the insulin vials. Keep all supplies and medication together for easy access in case you need it.