They may not have it available on their phone, or have to pay a charge for it that they can't afford to pay if they don't have a job even if it is a very small charge. I'm also sure that they still have friends and a life outside of looking for a job (especially if they are out of work, they probably need the stress relief of having fun and support of a friend), maybe they were to busy hanging out with a friend, or were in the process of handing in an application and didn't want to look unprofessional or unavailable to have an interview on the spot if the opportunity had presented itself. They could have been in the bathroom, or perhaps sleeping.... because you know you don't stop needing to do these things because you are looking for a job. There's plenty of reasons they could have missed the call. Nobody can monitor the phone the whole entire day. Also they never said they were unemployed, just job searching so they could have a job but be trying to find something better. Anyway, sorry OP, that sucks. Hopefully you find something soon.