We switched two phones from Verizon and my work phone from Straight Talk all over to Cricket. All three are different versions of the iPhone, the newest being an iPhone 11 and the oldest being an iPhone 6. We immediately noticed texts messages can be extremely delayed, some never sending or being received at all. This happens on a daily basis. All phones have iOS up to date and all phones were troubleshooted with everything under the sun found on the internet. We also noticed things that use WiFi are now slower (also thoroughly troubleshooted), and we don’t get Ring doorbell notifications until two minutes after someone leaves our front stoop. Is this SIM card related? Server related? And ultimately, is this something that can be fixed? If not we will need to switch immediately, as my work phone often requires a prompt response to text messages.