What app can I use for messaging in Mexico

I'm going to Mexico next week for a few days & I know that Sprint charges.15cents receiving messages and.50cents sending but also using an app costs 4.00 everytime I use it.
Is there a messaging app I can use that won't charge me or being able to at least use twitter?!
I have an iPhone 4 & it's also jailbroken if there's any apps that can help me.

How to sync music to my iPhone other than iTunes?

I hate having to sync over every song again when I just want to add a few new songs to my phone! Any way around it? I use iTunes on 3 different laptops but it got deleted off one - the one with All my music already on it:/

How much will it cost for an iphone water damage repair?

Today my iphone (3gs) fell in a bucket of water- i took it out, and put it in a towel, and then shook out the water- the screen kinda flickered and said "charging is not available with this accessory" the touch screen didn't work either. I also tried drying off the sim card but that didn't work. Now its sitting in a bag of rice… Is there anything else i can do to fix it, or how much will it cost to get fixed? Any repair shops? I hear that water damage isn't part of the warranty.

How to stop getting these frequent text messages from 9016?

Keep getting frequent text messages from 9016.

This is the text message sent- //ANDROID:${from} has sent you a Sprint Voice Message. Call ${callbackno} to listen. CFGs1840.0=1054dcf3b678d1549e61u5n2D0jA/…

After doing my research, i was informed that i receive these text messages because i use a third party sms app or hand cent. I don't use either. If it helps, i own an iPhone 4 for sprint. How do i stop these annoying text messages

Should I change my iPhone for an android?

I want to change my phone because I've been having problems with it like I loose connection to my Wi-Fi alot and i end up using 3g Internet. Does this happen to android as well or what?

Does Verizon include tether data in its cellular network data count on the iPhone?

I have an iPhone 4S and I have the 2G data plan, so I'm getting a little worried that I've only had it for a week and a half and my phone is already saying that I've used 600 or so MB of "Cellular Network Data". I have Wi-Fi available at my home and I use that whenever available. I do check Facebook and other social networks relatively often away from home. However, the data counter on my phone lists nothing used under the "Tether Data" count, and I'm under the impression that this count should include Wi-Fi. So I want to confirm, am I really racking up usage on my 2G of data or is it including Wi-Fi and such and if so how can I find out how much data I have actually used on the plan? Please answer if you have any idea.

Iphone 4s 3g usage problem

My Iphone 4s randomly tells me that i've used half of my usage when i don't use it that much. It went up to 90% one time when I probrably used the 3g once or twice in that whole time. I just got a text that says i've used half of my allowed usage when my phone was just sitting there! I really don't want to be charged extra for going over the allowed data I have… What's the problem? What should I do?