Any way/option to switch off iPhone 3G/4G when a certain Wifi is disconnected or detected

When iPhone is connected to Wifi, does Wifi takes priority over 3G/4G for
data (movies, browsing Net & Whatsapp) usage?

My kid's data plan (3G/4G) tends to get exceeded when she watches movies/videos
at home but we have free broadband Wifi at home.

When she's at home, she only needs Wifi (for browsing the Net, watch movies &
Whatsapp) but very often, her often got disconnected from Wifi & she does not
notice it, thus incurring lots of 3G/4G bills when watching movies on Internet.

Is there any way to turn off the 3G/4G automatically when her connection to
Wifi while at home is dropped?  Any freeware to do this?

Purpose is to reduce the data usage while at home.  Very often, just rebooting the
Wifi broadband router or re-establishing connection to the Wifi service on her phone
will do the trick but she often did not pay attention to it when the Wifi link is dropped
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sunhuxAuthor Commented:
I thought of removing the SIM card when at home but she has a casing which is
rather to remove & there's concern she may lost/misplace the microSIM card
JohnBusiness Consultant (Owner)Commented:
If your Wi-Fi at home works on the iPhone (set up a profile for it), the iPhone will always use the Wi-Fi instead of 3G/4G. I do this all the time on our two iPhones in the house. It is automatic if the iPhone has not be screwed up.
sunhuxAuthor Commented:
Have set up a profile for the Wifi on the iPhone : in her room, the Wifi signal is weak or
not so good.  I always get the weakest Wifi signal shown on my laptop when I'm in my
bedroom too.

Hmm, maybe a signal booster like TP-Link's 300Mbps HGigh Gain Wireless USB adapter
(TL-WN822N) will help?  Is this adapter meant to be plugged into the Wifi broadband
router or to the laptop?  If to the laptop, can it be plugged into an iPhone?
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sunhuxAuthor Commented:
Or is there some sort of adapter than when plugged into the iPhone's lightning port will
auto disable the 3G/4G while enhancing the Wifi receptability on the iPhone?
sunhuxAuthor Commented:
JohnBusiness Consultant (Owner)Commented:
The switching is part of iPhone and automatic. If the signal is weak, the phone will default to cellular. That is the way it works. You would have to disable Cellular to use only wireless.
JohnBusiness Consultant (Owner)Commented:
Re the attachment. You would have to take your chances. I do not need this and have not used it.
Eoin OSullivanConsultantCommented:
Q1: Yes, WiFi takes priority over 3G/4G for data when available.
Q2: No, there is no way to turn off the 3G/4G when the wifi is dropped.  There is no freeware or commercial apps for OSX to do this without jailbreaking the iPhone.  You can disable data in the Settings but then 3G/4G will not work when out of home .. and your daughter will have to turn it off and on daily.

Forget about that eBay advert .. that simply a replacement part .. if does not offer any enhanced performance.  There are NO lightning adapters to boost WiFi reception .. but some phone covers do affect WiFi and phone reception so that may be a partial factor.

Also forget about the TP-Link .. that is to allow PC desktop/laptop to have improved WiFi reception .. it will NOT work with a phone

Apart from teaching your daughter to pay more attention - the only solution is to improve the WiFi coverage in the room so that it doesn't disconnect.  

You can either use a better/more powerful WiFi router at the point in your home where the current router is located .. or maybe look at Powerline adapters.  These use your home electrical network to allow you to put a WiFi repeater at any electrical socket .. which gives great WiFi reception in any room .. and connects back to the main modem/router and saves you running new ethernet cables from room to room.
Kyle SantosQuality AssuranceCommented:
I have a limited data plan myself.  What I do is turn off each app's cellular data that I know I don't want running when I'm not on WiFi.

Go to Settings > Scroll to the app you ONLY EVER WANT USING WIFI, like Youtube or Netflix > Use Cellular Data and toggle it off.  As eoinosullivan stated, your daughter would have to manually turn it on/off every time if wifi wasn't available, but at least the phone would respect your desire to NOT use cellular data when it comes out of reach of the WiFi.

Kyle SantosQuality AssuranceCommented:
Another clutch thing to have toggled off to save cellular data is go to Settings > iTunes & App Store > Automatic Downloads (toggle them off) and Use Cellular Date (toggle this off).  This will prohibit automatic downloads from chewing up your data plan when not on WiFi.

When your daughter is 100% on wifi she can manually update apps as necessary and select which ones too.  Not ALL apps need to be updated and can be updated at yours/hers discretion.
Kyle SantosQuality AssuranceCommented:
@sunhux, any updates for us?
sunhuxAuthor Commented:
Excellent responses: powerline adapter is new to me.  
Yes, my Wifi signal is rather weak from bedrooms as the various laptops showed:
laptops connect with single bar, so I guess the iPhone 5S just can't connect to it.

one more query:
can give me step by step instruction on how to disable 3G/4G (globally for entire
phone for all apps) in iOS 8 & how to enable it back?  My kid doesn't know this
& I'm no iPhone user
JohnBusiness Consultant (Owner)Commented:
Go to Settings, Cellular, and disable by turning the top button OFF. That will do it.
sunhuxAuthor Commented:
My Wifi /broadband router is Aztech DSL7002GRVIS & it emits two SSID:
MEOnly  & MEOnly-5G : was told by the Telco installer that the one with -5G
is faster but the distance it covers is lesser than the other one without -5G.

In the living room both signals are Excellent ie 5 bars on my Thinkpads.  But
in the bedrooms, the one with -5G is only 1 or 2 bars while the other one is
usually 2 bars. Does the above info give any clue?

In the days when I was on the older 2Wire Wifi router, I could get up to
four bars from the bedroom but this new Aztech router has Gbit LAN
ports while the 2Wire has only 100Mbps LAN ports.  I'm not sure if I
were to switch back to the 2Wire router (boxed inside the store room
for 1.5 years already) will still work
JohnBusiness Consultant (Owner)Commented:
Hard to say what will work for you. If signal is not adequate, then by all means try a different router.
Eoin OSullivanConsultantCommented:
Some of the newer/faster broadband standards often have higher speed but shorter range.

802.11n has some of the best range .. and the ac and newer standards are not as good and rely on more data streams to increase data speeds

Step 1 find out what standard the older wifi router used? the Aztech should be using 802.11n
Step 2 plug in the old one and see if you can get better reception in the bedrooms.
Step 3 there are some settings on many wifi modems which support 802.11n like the Aztech you might be able to use like disabling backwards b/g compatability to improve signal strength

If you've no devices plugged into the ethernet ports on the router .. then the speed of the router ports makes no difference to the wifi.

Also worth noting that some wifi routers are better than others for wifi signal strength and coverage .. I cannot comment on the quality of Aztech but many of the FREE routers you get from telcos are not the best of breed!!

If you use Powerline adapters you can benefit from the gigabit connection on the router .. to connect the base unit of the powerline and then connect to the bedroom wifi powerline transmitter.  One transmitter could cover a few rooms if placed strategically.

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