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Every time I call out and only have 1-3 bars it continues to pop up call failed and not allow me to call out to anyone, but when I have a full bar everything works perfectly fine.
turn phone off and on. it may also be person your calling has no signal
You can try doing a manual roam to refresh your signal connection:
Yes happen to all of us at times.
Nothing to do with network just signal problems that is all.