Can't connect to 3G after IOS 9 update iPhone 4s

[Ellierosehawes]

After doing the ios9 update I am unable to connect to 3G on my iPhone 4s. I have tried calling but hung on for 40 minutes and then got cut off! Need help!

[BandOfBrothers]

Hi,

On the iPhone hold down the Sleep/Wake Button and Home button together until the Apple Logo shows. Then On seeing this Apple Logo release both buttons ,and the iPhone will reset , which has been known to clear most glitches.

Settings -> General-> Reset -> Reset All Settings.

Its worth checking if you have an Carrier updates pending. 

 link https://support.apple.com/en-gb/HT201270

Please check in your settings that 3G is still toggled on and try texting WEB to 40127 

Ive seen reports elsewhere that for some the update changed some APN Settings. 

 Tap Settings.
In the first section tap Mobile/Cellular.
Tap Mobile data network/Cellular data network.
Enter the following settings into the onscreen form, without changing any other settings;
Mobile/Cellular Data:
APN - internet (PAYG - pp.vodafone.co.uk)
Username - web (PAYG - wap)
Password - web (PAYG - wap)
Visual Voicemail:
MMS:
APN - internet (PAYG - pp.vodafone.co.uk)
Username - web (PAYG - wap)
Password - web (PAYG - wap)
MMSC - http://mms.vodafone.co.uk/servlets/mms
MMS Proxy - 212.183.137.12:8799
MMS Max Message Size - 307200
(As a check, the image below shows blue text in the fields you should have completed)
Tap the left arrow at the top three times
Press the home button
On the status bar at the top of the screen, next to the name of your mobile network, you should now see a data connection indicator 4G, 3G, E or GPRS. This means the data connection is live and working.

Device Guides from Vodafone http://support.vodafone.co.uk/Device-Guides/?manufacturer=Apple&type=Phone&model=iPhone+4S#

[Ellierosehawes]

Thanks for your reply unfortunately I can't reset my phone as my sleep/wake button has recently broken.
The symbol for 3G is there but if I try to access the Internet it just says:

'Could not activate mobile data network:
You are not subscribed to a mobile data service'

What does this mean?

[BandOfBrothers]

It could mean your APN settings are not right. 

Use the the link I added and check yours in Settings-Mobile Data-Mobile Data Network 

or try the text WEB option.