How to delete iPhone WhatsApp group chat history quicker?

I'm trying to delete this group chat conversation from my iPhone 4S which has been going on for more than 4 months. When I try to delete the conversation, every 10 minutes my phone crashes and I find out nothing has been deleted. There have been more than 40K messages over the 4 months. I would just like to find any alternative way in which I can delete this chat history and leave the group quicker other than deleting the application because I have to buy the app again for 59p

Greyed out Wi-Fi on my iPhone 4?

I lost my phone two days ago at a golf course and found it yesterday afternoon after going back to look for it. It rained the night before so my phone had some water under the screen but no significant damage with the touch screen or buttons. Everything still works on my phone just fine except for my Wi-Fi connection. It's greyed out and gives me no options to turned it on. It's just stuck off. What happened to it and is it fixable?

Added (1). I did put my phone in rice for a while, not 24 hours long but at least 9.

Does the personal hotspot on iPhone 5 cost money?

I've heard it just takes data from your phone that you have, so every new month I get 6GB back from what I used.So, does it take away the 6GB or like cost a bit extra on the bill?

I'm with Bell.

Whatsapp last seen at won't work? - 1

I have an iPhone4s
The other day I was talking to a friend on whatsapp and it said she was last seen at 17:17 but sent me a message at 18:35 and I turned my phone on and off to see if it would go back to working again but I didn't so I went on google and it said to turn off the timestamp then change the time and date on my iphone then go back to whatsapp and turn it back on but I didn't work so I waited 24 hours to turn it back on and now it's saying "could not connect to whatsapp servos. Please try again later" It's said that earlier too.

I deleted the app and re downloaded it again but that didn't work either:/ does anyone know how to fix it? Please?

SIM card isn't working in iPhone?

I got an iPhone 4 yesterday and inserted my tmobile SIM card. It has now been 24 hours and my iPhone is still saying no service. Somebody please help

What to do about eBay buyers you know aren't genuine?

I just listed an iPhone 5 on eBay (an unwanted upgrade) brand new and everything, hoping for a quick sale. Within 3 minutes of the listing, someone had purchased it. Great, I thought, iPhones must really be in demand. But when I look at the buyer's profile, they have 0 feedback and all their details seem fake (unless the guy has a really strange name). I'm pretty certain this buyer is a faker and isn't going to pay up anytime soon and tbh I'm worried about getting scammed. I have to wait 4 days for him not to pay before I can take it up with eBay. Is there anything I can do in the mean time? I've already sent him a payment invoice with a message attached.

Using a US iPhone in the UK?

So I want to buy an unlocked iPhone in America since its cheaper, and then bring it back to the UK, will it work? Or is this a silly idea?

Advantages and Disadvantages of a CCD (Charge-Couple Device)?

So I'm doing a science project, and for my specific project, I have chosen the Charge-Coupled Device, or CCD. For one of the sections in this essay, however, I'm meant to describe the advantages and disadvantages of a CCD.

NOTE: THIS IS FOR AN ASTRONOMY UNIT. I do not want to know about how compatible it is with modern day iPhones or that kind of stuff. I want to know the disadvantages and advantages of using it for astronomical purposes-telescopes (esp. The Hubble Space Telescope). A good example would be that it has much higher resolution, and can capture objects much further away, etc.

The CCD replaced photographic plates in astronomy. If you could compare the two and list how the CCD is an improvement, extra props to you.