IPhone keeps dropping off the wifi

[RubyRose1]

At home my mobile signal is very poor if I’m lucky, but usually non existent so I use a mobile provider that has WiFi calling and texts. I leave my iPhone in airplane mode and just use via WiFi. This was working very well for me until maybe 4 or 5 months ago. 
I now find that my iPhone is constantly dropping off of the WiFi. I can’t make calls or send texts without turning the WiFi off and on in the iPhone settings. Sometimes this takes several attempts. Anyone that tries to call me just gets a message saying that my phone is turned off. 
I was hoping that this problem would sort itself out, but it hasn’t. I don’t get this problem with my iPad it’s just my iPhone. 
Any suggestions please to sort this out?

[Chris-TalkTalk]

Thanks. Could you switch your router off and leave it off for at least 30 minutes, then switch back on and retest. Please let me know how you get on

Chris

[RubyRose1]

Updated as requested Chris

[Chris-TalkTalk]

Hi RubyRose1,

Can you please update your community profile to include your:

• Name
• Telephone number
• Alternative contact number

We'll then look into this further. Please do not post this information on this thread. Once you've updated your profile please post in your topic to confirm it's updated.

Thanks

Chris