PLEASE READ THIS:
As most of users here, i tried do to many settings
since X or Y said that works for me.
Never really succesfull.
For me the main problem is the usage time is growing
while the phone is doing nothing. 3 to 5 % lost every
hour. I find that unacceptable and i almost decided
to sent back my IP4S to my internet provider since
they sold me the phone.
Then i decided as very last test tu activate and try to
use the micro SIM card they sent to me 3 days ago.
I talk to them , asking if i really need to activate and use
the new SIM since mine is coming from my IP4 already
from same providir ( SFR in France).
They told me forgot the new card yours is still ok
no need to activate it.
BUT, when my new activated SIM was put in my IP4S
You know what ?
For the fist time in 2 weeks, i can see my phone
working normaly, i mean still 100% after 1 hour standby
and usage time 2 minutes ! i never seen that before.
3G and wifi are both Set to ON and i keept some
adjustment we discuss before but now, using the phone 2
or 3 times per hours for checking mails and news,
the battery loose only 2 to 3 % for 1 hour.
If the situation remains like this, i stop to complain.