xperia sl not making calls

[sela]

i cant make or receive calls on my xperia sl but can browse and txt...

[Phy]

This could be a network issue or a SIM card problem,  boot on safe mode to narrow down the problem.

How to boot on safe mode.
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

[sela]

the internet is always on edge

[Phy]

It's possible that it may be an issue with the network and not the phone itself.

[AnnL]

If you reboot in safe mode and the problem still exists, then what?