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- Australian carriers are blocking 4G phones based on whitelists, citing government mandate/ruling/whatever. Consequently many 4G phones are getting stuck in No Service state.

- Previously, phones that weren't whitelisted could connect to 4G for Internet, and disconnect & fall back to 3G for calls.

- Voice calling on 4G is finicky, and carriers don't like supporting random customer bought contraptions trying to do it.

- (you can whine all day about how calling is the sole defining feature for an object to be a "phone", doesn't change the fact that calling on 4G is a carrier-grade ever-beta duct tape hack).

dc: iiuc