mobile standby

[Guest lazyliam]

Referring to galaxy s not San Fran but can't post on xda and this site/forum has always been amazing to me I'm getting really high maybe 25 percent time without signal but phones never left my hands and all though I am getting 1bar and even no bars signal quite often phone always carrys giffgaff in notification and never emergency can anyone shed any light on what's happening and does it.mean 25 percent of time I'm actually not contactable any help much appreciated