Modern bike security, a lock with GPS and SIM card?

Sophisticated bicycle GPS trackers have been on the market for a while now. You can even get some that can be hidden in the seatpost or handlebars and the battery life will be different on different trackers and how regular you want the GPS reporting.

Smart locks do exist, but having a conventional lock, one that isn't permenantly fixed to the bike, is not much use (IMO) in the event of a theft, thiefs rarely take the broken locks with them, and by the time you get to the location of the theft, they will likely be gone.

A bike lock such as the I lock IT might be something to consider, although without knowing the bike you plan to protect, I can't advise on compatibility.

I don't know of any conventional bike locks with SIM and GPS functionalities, there are some with bluetooth-like alert systems, but you would have to be within Bluetooth distance of the bike.

You can also consider GPS tracking bicycle lights. Although, if you live in a place with bike light theft is high, this might not be an option.

Personally, I would invest in good bicycle insurance (and Gold Standard lock) before looking for any GPS systems. Bare in mind that difference insurers will have differe policies on claiming for bike theft, triple check all the small details required before thinking you are covered. This might include what lock you use, what you lock the bike too and where on the bike you place the lock.