Storage problem? New texts and photos are no longer saved

I recently returned the UK from the US, so I removed my US SIM card from slot 1 and replaced it with a UK SIM.

Since then, my phone has been unable to save texts and photos.

When I receive a text, the notification pops up on the “home” screen, but then the message disappears: when I tap out of the pop-up and go to the “Messaging” app, the text isn’t there. The same thing happens with photos: when I take a photo or video, the preview appears as a thumbnail, but when I tap on that thumbnail, it disappears and the photo/video hasn’t been saved.

I’m not very tech-savvy (sorry), but here’s some more info:

I have 1.76GB of free space.
Model number: FP1U
Android version: 4.2.2
Kernel version: 3.4.5

Huge thanks in advance for any advice!

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