Asking "How secure is this?" is essentially the same as "What angles of attack would this prevent?" So if your phone is susceptible to a very basic dictionary attack (which is just a codified way of saying "susceptible to educated guesses") then it is not "just as secure as any other code" because there are other passwords which aren't susceptible to this attack.
Note that my post was responding to the claim that it's "just as secure as any other code". It is not.
If you myopically only look at the most basic of attacks, then you can use crap security and it will work for those attacks. But a US Congressman could obviously be a target of sophisticated attackers. And you're literally proposing an attack which would break your proposed password, yet still defending the claim that it's just as secure.
I was just reading someone's comment saying they come to HN because the comments are so good, and I can't say I know what they're talking about. So much uneducated speculation about comments taken out of context is being presented as fact in these comments.
If you really want to delve into the specific scenario of a US Congressman then there are many more factors like how are you going to get access to the phone at all? How are you going to avoid the lost mode activating? Iphones have limited tries before permanently disabling so how many are you going to risk with a dictionary attempt? Would you really put 111111 as the first try considering most people wouldn't use that?