Currently we use the u-blox factory default of 0 for +UMNOPROF, but do intend on switching this to AT&T (2) for Particle internal SIMs on devices that use the SARA-R410M-02B modem. You can make this change if you wish at any time via Cellular.command() as Rick mentioned above, but I don't know of any differences you'll see currently when using the Particle SIM.