iMessage and Texting?

It's cuz your data's off. Sorry but you might need to go into settings and turn if iMessage until you get more data.

 

Either turn off iMessage permanently or turn off iMessage each time you go out, then turn it back on when you get home.

They're your only two options without data unfortunately

 

This. iMessages don't take up a lot data. Maybe just turn it on when you're meeting your friends.

 

I believe you can also selectively enable or disable what apps can use cell data, so you could potentially leave it on but disable it for most apps except Messages and maybe a few others you might need.

 

waste of nice hardware

Why do you have an iphone 5s and only 250mb/month?

That´s like buying a ferrari and only put a soda can worth of gas in it every month.

They are both designed for (and deserves) a lot more

 

If you are on WiFi a lot and can save a lot of money with having a little data, why not?

 

The iphone is the most data-hungry phone ever made, seems like a miss match to have the lowest data plan possible. It ruins the experience a bit.

I use at least 10GB, and this month i´m approaching 20GB..
But I might use my new phone to much

 

To each his/her own. Some can certainly be more then fine using almost no mobile data based on what they use it all for and perhaps availability of WiFi and other factors, while others might be using exponentially more mobile and WiFi data than typical users who use a GB or two every month.

 

I use less than 380 MB of data per month, and us WiFi most of the time since WiFi is just about everywhere I go. This saves $$ for those that do not want to waste good money like the OP is doing. Nothing wrong with that on a very good iPhone. Some also do not have unlimited data plans either.

 

Not everyone has a great need for a big data plan. I pay $3 a month for 100mb and I love it; it's truly all I need. I can do much web surfing on Opera Mini for very little data, and I can pretty much read as many emails and send as many iMessages as I'd like. Plus, really the only times I don't have Wi-Fi are when I'm out somewhere and I try to use that time socializing anyway.

 

If there were such a setting under your control it could actually be a big pain for your friends if they wanted, for example, to send you photos via iMessage. Normally, an iMessage photo sent using a phone's data plan will cost next to nothing. The same message sent as an MMS can cost an arm and a leg. The operators love dirty little scams like that as it's easy money for them.

Glad to hear you're thinking of finding a better data plan. Hopefully, it won't be too long before tiny allowances like 250MB per month are history.