For the sake of clarity it is worth noting that SignalRefresh in no way contains any kind of hidden magic or offer any guaranteed solutions for users who may be suffering from severely poor and permanent signal. The package essentially acts as quick way of accessing deeply buried system settings and serves only to refresh the network and Wi-Fi settings in the hope that when it comes back online it picks up a stronger signal.
We haven’t tried it out for ourselves, but according to those who have, it seems like it does work as intended. However if you’d rather not jailbreak your iPhone, alternative means of helping to lock onto a stronger signal would be to enable and disable Airplane Mode. However those with jailbroken iOS devices can download the SignalRefresh tweak via the Cydia store from the BigBoss repository for 99 cents.