Can I still use my iPhone when service gets cut off?

I have an iPhone 4 and it's with Cricket. Will I still be able to text with just a Wi-Fi source?

Of course. Just not for calls messaging or Internet, unless on Wi-Fi

You can iMessage with just a Wi-Fi source, or you can download a texting app that also uses Wi-Fi. There are some apps that let you call even, but of course you have to be on Wi-Fi.

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