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Hi,
I appreciate how frustrating it is when signal fails, fringe coverage or intermittent connection presents issues.
Can I ask the following set of questions 
Can you turn off 4G in the phones settings usually found in the Mobile Data section and then turn it back on.
If you turn off 4G what's the experience like on 3G ?
Have you Zoomed out on the map in that mast Checker to see if any local masts are at issue ?
Does 4G show in your phones status bar and remain there i.e. Not dropping to 3G or below etc ?
Can you test your SIM card in another known to be working phone with 4G.
Can you try another known to be working ok SIM card in your own phone as a process of elimination.
Any Vodafone Highstreet Store can replace the SIM via a Sim Swap if it turns out it's the SIM card possibly at issue.
Does 4G work ok while commuting away from your home and surrounding area ?
Mast congestion can affect masts depending on how many people are accessing that particular mast at any one time.
If a phone isn't supported by the shortcode system then sending the WEB text wouldn't yield results.
However this his is the device guide here > Set-up-your-phone-for-internet.
And from Geeksquad here are the Vodafone Apn settings for Android.
"Tap the Menu button
Tap Settings
Tap Wireless and networks or More... (depending on your version of Android)
Tap Mobile Networks
Tap Access point names
Tap the Menu button
Tap New APN
Enter the following data into the onscreen form, without changing any other settings;
Name - Vodafone Internet
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
MMS Port - 8799
Authentication type - PAP
APN type - If given a choice, select internet+mms, if the keyboard appears enter *
(As a check, the image below shows blue text in the fields you should have completed)
Tap the Menu button
Tap Save
Enable the newly-added APN by ensuring the line is ticked, or the radio button is lit by tapping on it
Check the notification bar for 4G, H, 3G, E or G with up and down arrows beside it, which will indicate your connection is working"
Vodafone have provided a specific Self Help Thread that holds Initial Checks and a Template that asks certain questions that will Help us and the Tech Team to ascertain what's possibly going wrong in your area. Please would you re post the template with your answers.
Customer service via 191 or Live Chat (link in my signature below) can check your account out.
