I was able to make out the texts.
"Hi, are you there???"
"Hey, running a little late"
"I've been here for 30 minutes"
"Okay, I am running very late"
"*SIGH*"
It's possible she's seeing someone, but if so, it's clearly not going well, despite the smile. It's also possible that's just Vicky she's texting with. Alternatively, the text image may just be a generic asset that isn't actually what she's seeing when she smiles, which makes sense since it'd be pretty weird to smile at that conversation. Dev does seem to use stock phone screen assets, as MC's phone has read 17:30 when it's supposed to be early morning. The blurriness of the texts could indicate a stock asset that isn't meant to be readable.