Giff gaff O2

[gaz1234]

So I know gg is using o2s network. Is this reliable on an iPhone? Do gig still get same coverage as O2 or are they like a cheaper crapper provider?

[gaz1234]

Are they all on 1 month contracts?

[gaz1234]

When is this?
I'm looking at the 7.50 and 10 quid ones

[gaz1234]

Can I set a renewal based on usage e.g when minutes get low or data low to top up.
Can I pay for a month but use it till it's ran out, say 3 months, then top up?