If they are at different high schools?
DS1 has gone to high school with about 50% of his group of friends from primary school - the other 50%, he doesn't seem bothered about staying in touch with.
Is this normal? He has a phone so can text, make arrangements etc but just hasn't. He is very lazy laid back and finds it easy to make new friends so has settled in well at high school.
I know other friends have made arrangements at weekends etc (cinema, sleepovers etc).
How much do your year 7's keep in touch?