The 'E', 'H' or 'G' signal that you get is dependent on your network reception not your phone. So the only thing that you can do is to move to a better reception area.
Hi there @kateykelly
Your device is set to automatically switch between signal,and its not possible to choose.
Please can you firstly click onto this link http://statuspage.giffgaffapps.com
If you could also try turning your device OFF and take your sim card out, then wait 5 minutes,and turn your device ON again,as this can help in most cases.
Also try turning your airplane mode ON and OFF again ,and if your issue has not been resolved,check the signal in your area,by visiting or clicking onto the link below.
Please be aware that the website is updated hourly, so there may be a current issue that's
not showing at the moment,so keep checking the signal checker website over the next few hours or so for any new updates.
See here http://bit.ly/ggservice
If the signal checker is showing NO reported issues,you could also perform a manual roam,which basically is searching for networks on your device.
Go to your phone's "settings" and Select mobile network options and Change the Network Selection Mode from Automatic to Manual, and list of available networks will be displayed after a few moments, ( be patient whilst your device starts searching for all the available networks) .
Once all the available networks are showing,
Select any other network that is not your own network,and After a few moments you will see "No Service" on the display.
Now select your home provider(which is O2/giffgaff) network and change the selection back to Automatic,and see if that helps.
Please also check out this great guide here http://community.giffgaff.com/t5/Using-giffgaff/Force-the-change-of-SMS-settings/ta-p/4871794
Ive just found you a fantastic guide that may help you further here http://community.giffgaff.com/t5/Blog/G-H-E-3G-and-LTE-Making-sense-of-cell-network-alphabet-soup/ba...
E is an extension of GPRS, it is called EDGE and it is correspondingly a little faster, but still uses the old GSM network (2G).
H and H+ are standing for HSPA and HSPA+. Both use the UMTS network, where H is faster than 3G and H+ is faster than H.
(Taken from Thewww at This Post)
Check your settings to see if it's set to EDGE only, if so change to ensure HSPA is also active.
If it is then it comes down to signal strength, there's a good chance you're in a low signal area (have you tried more than one place?) It might be an idea to check your Coverage.
Depending on what phone you're using, have you considered using a browser with a low bandwidth usage? EG Opera Mini has an optimised form which lowers the quality of photos to load quicker on media rich websites, Google Chrome has a similar setting called "Data Saver" that compresses media on the Google Servers before coming down to your phone..
Hope this helps a bit!