Definitely. Phone companies are especially vulnerable to social engineering. It has happened to various other people, including linustechtips and even cloudflare's CEO.
You can't outsource your computer/cryptocurrency security to a 3rd party like your phone carrier. It's a recipe for disaster.
The services are vulnerable too. 2FA isn't safe if you use it with your phone number.
Hackers are targeting prominent bitcoiners - but it's only a matter of time for the rest of us.
Hackers are likely more interested with the people holding a larger amount.
Thieves are impersonating prominent bitcoiners, asking friends for "loans" of BTC (etc) - which just means more victims.
It's weird if a friend asks you for a loan over the phone. Anyone receiving such a request SHOULD verify it physically, especially if its for a large amount.
It's not just bitcoins - bank accounts and everything else are vulnerable. (And you can't fix those with a Trezor or paper wallet.)
For the banks I use, the bank account have physical OTP keys and they are much more difficult to compromise.
Bitcoins aren't vulnerable if you choose to secure your coins with a desktop/cold wallet. The reason why Bitcoins are lost through this is because of people storing them in services.