I have T-Mobile and last year my phone could barely work to send out texts. My friends on Verizon were able to video call each other.
If you don't have verizon you can sign up for this free trial, use your phone as dual SIM and you'll be able to have phone calls and texting much better at edc!
https://www.verizon.com/plans/free-trial/
This will only work if your phone is not locked to a carrier. I didn't have to give a credit card or any payment information, and I can still use my regular service


