Minsan po depende sa phone...
Nangyari na din kasi sakin noon.. Walang internet sa phone ko pero nung sinaksak ko sa pocket wifi yung sim ko meron naman...
I would also experience that from time to time and probably because of constant system upgrading or being "kicked off" from the network. I say this because I usually have more than 1 Globe sim connected to data and sometimes at least one would have no data.
What I do is to turn on airplane mode then turn it off so it could refresh. Most often than not it works.