What Wi-Fi changes
Wi-Fi moves internet traffic through a local router instead of the mobile cell site. On a home connection in Morocco, that often means a fibre or copper line into the building, then Wi-Fi for the last few metres. Mobile signal in the room can be poor while Wi-Fi is fine, especially behind thick walls. The reverse happens too: the router is far away, and the mobile network by the window is the one that works.
Joining Wi-Fi does not by itself make a phone call. A normal mobile call still uses the cellular voice service unless the phone and the operator are using Wi-Fi calling. App calls, by contrast, use whatever internet path is active. If Wi-Fi is connected, an app call usually prefers it. Confirm the Wi-Fi icon is the one you intend. Phones quietly return to mobile data when the Wi-Fi is captive, weak, or asking you to tap “accept” on a portal you have not opened.
Wi-Fi calling is a setting
Some phones have a switch named Wi-Fi calling, and some operators support it on some plans. When it is working, a standard call can travel over the internet and still show your mobile number. When it is not supported, the switch does nothing useful. Test it with a short call while you can see that mobile data is off, so you know the voice went over Wi-Fi. Do not assume a rental apartment or a hotel has enabled anything on your behalf.
A hotspot spends the phone’s data
A personal hotspot is the phone sharing its mobile connection. Every laptop update, video, and backup counts against the SIM that is sharing, including a roaming SIM. Turn it on for a task, watch the data counter, and turn it off. Leaving a laptop joined overnight is a common way to empty a pass. The weights in reading data use apply, often faster, because computers download more than phones.
Habits on a shared network
Use updated software. Prefer sites and apps that show a locked connection in the browser. Do not install a “security” profile or a certificate because a portal told you to. Do not reuse your email password for the Wi-Fi voucher. A virtual private network is one tool people use on shared networks. It hides traffic from the local router only until it reaches the VPN provider, and it does not fix a malicious app or a password you typed into a fake page. It is not a complete shield, and this site does not sell one.
For a conversation with family, a voice call over a network you control is the calmer option. If you only have café Wi-Fi, send a message or a voice note rather than a long video, and move banking to the mobile network or to home Wi-Fi later. Signal strength still matters for the mobile fallback: what the bars miss.
Four places, four different networks
A riad or an old apartment often has thick walls and a router in one room. Mobile voice may fail in the bedroom and work in the courtyard, while Wi-Fi does the reverse. Walk the call to the router rather than buying another SIM on the first evening.
A modern flat with fibre can carry a video call that the mobile network in the same street cannot, because the mobile site is shared with the whole block at dinner. Use the Wi-Fi you control for the heavy minute, and leave the mobile line registered so an ordinary call can still ring.
A café or hotel network is a shared room. Finish the portal or leave. Do not type a banking password because the portal page looked official. Do not install a profile because a splash screen asked. Messages and a map you already downloaded are the reasonable use. A long video with family can wait until you are on a network whose password is not on the wall.
A bus, a train, or a taxi is a moving cell, not a Wi-Fi plan. The connection will drop when the site changes. Send the text version of what you needed to say, and expect a call to resume rather than to stay beautiful. Hotspot from that seat spends the phone’s own pass, including roaming if that is the SIM sharing it.
Leave a network on purpose
If a portal will not clear, if the phone keeps flipping back to mobile data, or if you do not know who operates the router, forget the network. “Connected” with no page loaded is the phone waiting on a login you have not finished, often while mobile data quietly carries the apps. The two-minute test in the margin catches that. Check the mobile counter before and after one call. It should barely move when Wi-Fi actually carried it.