Since all mail has to be sorted to reach its destination, and there's little reason to expect that shipper and recipient data is given an expectation of privacy it probably does not even matter whether the company keeps records.
I suppose it is safe to assume that it would be unknown which SIM card is inside of the package, but having a list of recipients in a given area code and merely noticing when SIM cards came online in that area would be somewhat of a give away.
It seems like the phone would just encourage anyone performing surveillance that you are more likely to be communicating something they'd find interesting, and therefore they might spend more resources on looking at these customers.
I think it serves the public good when more people communicate in ways that can not be traced or listened in on, but I don't think it serves specific customers of this service if they have concerns about their own anonymity, and might be doing things like disclosing information about official corruption.
I suppose it is safe to assume that it would be unknown which SIM card is inside of the package, but having a list of recipients in a given area code and merely noticing when SIM cards came online in that area would be somewhat of a give away.
It seems like the phone would just encourage anyone performing surveillance that you are more likely to be communicating something they'd find interesting, and therefore they might spend more resources on looking at these customers.
I think it serves the public good when more people communicate in ways that can not be traced or listened in on, but I don't think it serves specific customers of this service if they have concerns about their own anonymity, and might be doing things like disclosing information about official corruption.