If you love the Nokia 2660 for calls and simplicity but need to share data for a laptop, simply carry a separate MiFi device (e.g., Alcatel LinkZone, TP-Link M7200). Insert your SIM card there, and use the Nokia 2660 for calls.

Press *#*#4636#*#* (not supported) → no effect.

You can still access the internet directly on the phone using mobile data, though the experience is limited:

Below is a draft blog post addressing this topic for your audience. Nokia 2660 Flip Be Your Mobile Hotspot? What You Need to Know