Your post was blank @Yunesb6226 and the title "No service" doesn't really tell us much.
If you want assistance from the Community Forum then you need to describe your issue in a bit more detail.
When was it working last, when did the problem arise, does anything work - incoming/outgoing calls/texts or data, do you have an active membership, do you even have a connection to the 48 network, did anything change - new phone, settings changes, software update, factory reset, any error messages, etc.
If you need to contact 48 support about this then see the link in my signature below or email them at support@48months.zendesk.com
