You'd also need to create new accounts for all your services each time, or any basic logging of access will trivially link your SIM, data provider's IP, your VPN, and your endpoint services. You only need to mess up once and your "anonymity" is compromised. In this instance it would be the IMEI of your phone, the tracking data used by advertisers and data miners to fingerprint your devices, and whatever services and accounts you use for email or social networking on your device.
Real anonymity is hard, and takes a level of paranoia not many can sustain without suffering mental health issues.
Real anonymity is hard, and takes a level of paranoia not many can sustain without suffering mental health issues.